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What Geography Studies

Geography asks where things are, why they are there, and how places connect. It uses a few core ideas to describe both people and the land.
  • Geography: the study of the spatial (where) patterns of people and the physical world, and the processes that create them. It answers 'where' and then 'why there.'
  • Graphics: the visual tools geographers use to communicate spatial information, especially maps, but also graphs, charts, diagrams, and photos. Maps are often called the language of geography.
  • Taxonomy: a system for classifying things into groups. Geographers build taxonomies to organize the world, such as types of regions, types of diffusion, or types of maps.
  • Holistic synthesis: geography's whole-picture approach. It combines physical factors (climate, landforms) with human ones (culture, economics, politics) and draws on many disciplines to understand a place as a whole.

Environment, Culture & Acculturation

Every place is a mix of what nature provides and what people build. Culture is the bridge between the two.
  • Natural environment: the physical world not made by people, including climate, landforms, soil, water, vegetation, and wildlife.
  • Cultural environment (cultural landscape): the natural environment as modified by people, such as farms, roads, buildings, terraced hillsides, and city layouts. Carl Sauer called it the cultural landscape.
  • Culture: the shared beliefs, values, language, customs, and material traits (food, clothing, buildings) of a group of people, learned and passed down over generations.
  • Acculturation: the process in which a group adopts some traits of another (usually dominant) culture while keeping much of its own. Example: immigrants learning English while keeping their home cuisine and holidays. Full absorption is called assimilation.

Human-Environment Interaction

Geographers have long debated how much the environment shapes people and how much people shape the environment.
  • Environmental determinism: the discredited idea that the physical environment (especially climate) directly controls human behavior and how advanced a society becomes. It was used to justify colonialism and racism.
  • Possibilism: the view that the environment sets limits, but people choose among many possible responses using culture and technology. Example: desert societies can farm with irrigation.
  • Arable land: land suitable for growing crops. Only about 10 percent of Earth's land is arable, which is why physiological density matters.
  • Sustainability: meeting present needs without compromising the ability of future generations to meet theirs.

Maps & Cartography

Maps are the main tool of geography. Different maps are built for different jobs.
  • Map: a two-dimensional (flat) representation of part or all of Earth's surface. Every map simplifies reality and contains some distortion.
  • Cartography / cartographer: cartography is the science and art of making maps; a cartographer is the person who makes them and decides what to show, what to leave out, and how.
  • Reference maps: maps that show the locations of places and features for general use, like the maps in an atlas or a road map. They answer 'where is it?'
  • Political map (a reference map): shows human-made boundaries between countries, states, or counties, plus capitals and major cities.
  • Physical map (a reference map): shows natural features such as mountains, rivers, lakes, deserts, and oceans, often with color shading for elevation.
  • Topographic map (a reference map): shows elevation and the shape of the land with contour lines; lines close together mean steep terrain.

Thematic Maps

Thematic maps show data about one topic, such as population, income, or voting, rather than general locations.
  • Thematic maps: maps that display the spatial pattern of a specific theme or variable, like a map of median income by county.
  • Isoline (isopleth) map: connects points of equal value with lines, such as isotherms for temperature, isobars for air pressure, or contour lines for elevation. An isopleth uses rates or averages, such as population density.
  • Choropleth map: shades or colors predefined areas (states, counties) according to a data value. Darker usually means more. Works best with rates, and its pattern can change if boundaries change (the modifiable areal unit problem).
  • Cartogram: resizes countries or regions in proportion to a statistic, such as population or GDP, rather than land area. In a population cartogram, India and China look huge and Canada looks small.

Map Scale & Projections

Scale tells you how much the map is zoomed in; the projection tells you how the round Earth was flattened and what got distorted.
  • Map scale: the ratio between a distance on the map and the real distance on Earth, shown as a ratio (1:24,000), a written statement, or a bar. Large scale = zoomed in on a small area with lots of detail; small scale = a large area with little detail.
  • Mercator's map: a 1569 projection by Gerardus Mercator that keeps shapes and compass directions true, which made it ideal for sea navigation. It badly exaggerates area near the poles: Greenland looks about the size of Africa, though Africa is about 14 times larger.
  • Equal area map: a projection that keeps the relative size (area) of landmasses accurate but distorts their shapes, especially near the edges.
  • Peters Projection map: an equal-area projection promoted by Arno Peters in the 1970s. It shows the true relative size of continents (Africa and South America look large) but stretches their shapes. It was promoted as a fairer view of the Global South than Mercator.
  • Distortion: every flat map distorts at least one of shape, area, distance, or direction, so cartographers choose a projection based on what the map is for.

Location & the Global Grid

Location can be described exactly, with coordinates, or in relation to other places.
  • Absolute location: a place's exact position on Earth, usually given by latitude and longitude (for example, about 40.7° N, 74.0° W for New York City). It never changes.
  • Relative location: a place's position compared with other places, such as 'across the river from New Jersey' or 'two hours north of Philadelphia.' It can change as connections change.
  • Latitude: imaginary lines (parallels) running east-west that measure distance north or south of the equator, from 0° to 90° N or S.
  • Longitude: imaginary lines (meridians) running north-south that measure distance east or west of the Prime Meridian, from 0° to 180° E or W.
  • Equator: 0° latitude, the line halfway between the North and South Poles that divides Earth into the Northern and Southern Hemispheres.
  • Prime Meridian: 0° longitude, which runs through Greenwich, England, and divides Earth into the Eastern and Western Hemispheres.

Time Zones & the Date Line

Because Earth rotates 360° in 24 hours, time changes by one hour for roughly every 15° of longitude.
  • Greenwich Mean Time (GMT): the time at the Prime Meridian in Greenwich, England, used as the reference point for world time zones. Today scientists use the nearly identical Coordinated Universal Time (UTC).
  • Time zones: 24 standard zones, each about 15° of longitude wide (360° ÷ 24 hours). Boundaries zigzag to follow political borders, and some large countries, like China, use a single time zone.
  • International Date Line: an imaginary line roughly along 180° longitude where the calendar date changes. Crossing it westward (toward Asia) adds a day; crossing eastward (toward the Americas) subtracts a day. It zigzags to keep island nations on one date.

Site, Situation & Globalization

Why a place grew where it did depends on its own features and on its connections to the rest of the world.
  • Site: the physical characteristics of a place itself, including landforms, climate, water supply, soil, and elevation. Example: a city's deep natural harbor or a defensible hilltop.
  • Situation: a place's location relative to other places, including access to trade routes, resources, and other cities. Example: Singapore's location on the shipping route between the Indian and Pacific Oceans.
  • Globalization: the increasing connection of the world's people, economies, and cultures through trade, communication, travel, and technology. Examples: global supply chains, international brands, and worldwide social media.
  • Time-space compression: faster transportation and communication shrink the effective distance between places, which speeds up globalization.
  • Distance decay: interaction between two places decreases as the distance between them increases.

Types of Regions

A region is an area unified by one or more characteristics. AP Human Geography uses three types.
  • Formal regions (uniform regions): areas where everyone shares one or more measurable traits, such as a country, a state, a language area, or a climate zone. They have clear, official boundaries.
  • Functional regions (nodal regions): areas organized around a central point (node) and defined by connections to it, such as a cell-tower coverage area, a newspaper's delivery area, or a city's commuter zone. Ties weaken farther from the node.
  • Vernacular regions (perceptual regions): areas defined by people's shared feelings and mental images rather than official data, with fuzzy boundaries. Examples: 'the South,' 'the Midwest,' 'the Bible Belt.'

Diffusion & Hearths

Ideas, innovations, diseases, and cultural traits spread from where they start. The type of diffusion describes how they travel.
  • Hearth: the place where an idea, innovation, or cultural trait originates. Example: Mesopotamia as a hearth of agriculture, or Silicon Valley as a hearth of tech innovation.
  • Diffusion: the process by which a characteristic spreads across space from one place to another over time.
  • Relocation diffusion: spread through the physical movement of people who carry a trait with them to a new place. Example: immigrants bringing their language, religion, or food to a new country.
  • Expansion diffusion: spread outward from the hearth while the trait stays strong in the original place, like a snowball growing. It has three types: contagious, hierarchical, and stimulus.
  • Contagious diffusion (expansion): rapid, widespread person-to-person spread through a population regardless of status. Examples: a viral video or a contagious disease.
  • Hierarchical diffusion (expansion): spread from larger or more important places or people to smaller or less important ones, such as from major cities to towns, or from celebrities to the public. Example: fashion trends moving from New York and Paris outward.
  • Stimulus diffusion (expansion): the underlying idea spreads, but the trait itself changes to fit the new culture. Example: McDonald's in India sells the McAloo Tikki instead of beef burgers.

Spatial Distribution & Density

Distribution is how something is spread across space. Geographers measure it with density, concentration, and pattern.
  • Spatial distribution: the arrangement of a phenomenon across Earth's surface, described by density, concentration, and pattern.
  • Density: the frequency with which something occurs within a given unit of area, such as people per square kilometer.
  • Arithmetic density: total population divided by total land area. It is the simplest measure but hides uneven settlement. Example: Egypt's arithmetic density looks moderate, though most people live along the Nile.
  • Physiological density: total population divided by arable land. A high number means a lot of pressure on the land that can grow food. Egypt's physiological density is very high.
  • Agricultural density: number of farmers divided by arable land. A high number suggests many farmers and little mechanization (often less-developed countries); a low number suggests mechanized, efficient farming.
  • Concentration: the extent of a feature's spread over space. Clustered means objects are close together (a village with houses grouped near a church); dispersed means they are spread far apart (farmhouses scattered across the Great Plains).
  • Pattern: the geometric arrangement of objects in space, such as linear (towns along a highway or river), grid (city blocks), or random.

Geographic Data

Geographers collect data from counts, surveys, satellites, and software to see spatial patterns.
  • Census: an official count of a population, usually with information on age, sex, household, and income. The United States takes one every 10 years, as required by the Constitution, and uses it to divide seats in the House of Representatives.
  • Geographic information system (GIS): a computer system that stores, analyzes, and displays geographic data in layers (for example, roads, rivers, and income on one map), so patterns and relationships can be compared.
  • Remote sensing: collecting data about Earth from a distance, using satellites or aircraft. It provides much of the raw data used in GIS.
  • GPS (Global Positioning System): satellites that pinpoint an exact absolute location on Earth.
Don't confuse absolute location (fixed coordinates) with relative location (context-dependent, can change).
A 'large-scale' map is zoomed IN (shows a small area in detail) — this is the opposite of everyday usage of 'large.'
Physiological density divides by arable land, not total land — don't mix it up with arithmetic density.
Mercator keeps shape but distorts area; Peters (equal area) keeps area but distorts shape.
Site is the place's own physical features; situation is its location relative to other places.

Population Distribution and Density

Population is distributed unevenly across the globe, concentrated in a few dense clusters.
  • Arithmetic density: total population divided by total land area
  • Physiological density: population divided by arable (farmable) land — a better measure of pressure on farmland
  • Agricultural density: number of farmers divided by arable land
  • Major population clusters: East Asia, South Asia, Southeast Asia, and Western Europe

The Demographic Transition Model (DTM)

The DTM describes how birth and death rates change as a country develops economically.
  • Stage 1 (Low Growth): high birth and death rates, little natural increase (no country remains here today)
  • Stage 2 (High Growth): death rates fall (sanitation, medicine) while birth rates stay high — rapid population growth
  • Stage 3 (Moderating Growth): birth rates start falling (urbanization, education, family planning) — growth slows
  • Stage 4 (Low Growth): birth and death rates both low, population stable
  • Stage 5 (Decline): birth rate falls below death rate, population shrinks (e.g., Japan, parts of Europe)

Population Pyramids

Age-sex population pyramids visualize a country's stage in the demographic transition.
  • A wide-based, triangular pyramid indicates high birth rates (Stage 2, rapid growth)
  • A rectangular/column shape indicates low, stable birth and death rates (Stage 4)
  • An inverted (top-heavy) shape indicates population decline (Stage 5)

Migration: Push and Pull Factors

Migration is driven by factors that push people away from a place and pull them toward another.
  • Push factors: conditions that drive people to leave (war, famine, persecution, lack of jobs)
  • Pull factors: conditions that attract people to a destination (jobs, safety, family, climate)
  • Ravenstein's Laws of Migration: most migrants move short distances, and most migration is step-wise/rural-to-urban
  • Intervening obstacles: barriers (cost, distance, borders, physical terrain) that hinder migration
A country can have a high population (large total) but low density (spread thin) — India and Canada are useful contrasts here.
Emigration is leaving a place; immigration is entering a place — from the perspective of the origin vs. the destination.

Culture, Cultural Traits, and Cultural Landscape

Culture is the shared beliefs, practices, and material objects of a group, expressed visibly on the landscape.
  • Cultural trait: a single element of culture (a food, a belief, a style of dress)
  • Cultural landscape: the visible imprint of human activity on the land (buildings, fields, signage)
  • Material culture: physical objects a group produces (tools, clothing, architecture)
  • Nonmaterial culture: intangible beliefs, values, and norms

Cultural Diffusion

Cultural traits spread from their point of origin (hearth) outward through several distinct processes.
  • Relocation diffusion: a trait spreads because people who carry it physically move
  • Expansion diffusion: a trait spreads outward from its hearth while also staying strong there
  • — Contagious diffusion: spreads rapidly through a population with little regard to status (like a rumor)
  • — Hierarchical diffusion: spreads from people/places of power or influence downward (e.g., a trend starting in major cities)
  • — Stimulus diffusion: the underlying idea spreads and is adapted, even if the specific practice does not transfer directly

Language

Language distribution and diffusion is one of the clearest ways geographers trace cultural history.
  • Language family: a group of languages descended from a common ancestral tongue (e.g., Indo-European)
  • Lingua franca: a common language used for communication between groups who don't share a native language
  • Dialects and isoglosses: regional variation within a language; an isogloss maps the boundary of a particular usage
  • Toponyms often preserve traces of earlier language groups even after a population has been displaced

Religion

Religions are classified by how they spread and how universal their appeal is intended to be.
  • Universalizing religion: seeks converts everywhere, appeals to all people (Christianity, Islam, Buddhism)
  • Ethnic religion: tied to a specific ethnic group or place, does not typically seek converts (Hinduism, Judaism)
  • Religions spread through both relocation diffusion (migration) and hierarchical/contagious diffusion (missionary work, conversion)
Don't confuse hierarchical diffusion (top-down, through influential nodes) with contagious diffusion (spreads to everyone nearby regardless of status).
A universalizing religion isn't automatically the largest — ethnic religions like Hinduism can still have enormous populations.

States, Nations, and Sovereignty

Political geography distinguishes the legal entity of a state from the cultural identity of a nation.
  • State: an independent political unit with defined territory, permanent population, and sovereignty
  • Nation: a group of people with a shared culture/identity, who may or may not have their own state
  • Nation-state: a state whose territory corresponds closely with a single nation's cultural boundaries
  • Sovereignty: the recognized right of a state to govern its own territory without outside interference

Boundaries

Political boundaries are classified by how and when they were drawn relative to the cultural landscape.
  • Antecedent boundary: drawn before the cultural landscape developed
  • Subsequent boundary: drawn to accommodate existing cultural differences after settlement
  • Superimposed boundary: forcibly drawn over an existing cultural landscape, often ignoring it (common in former colonies)
  • Relic boundary: no longer functions but leaves a visible cultural mark (e.g., a former Berlin Wall route)
  • Geometric boundary: a straight line following latitude/longitude, ignoring physical or cultural features

Devolution and Supranationalism

Political power can shift both away from and beyond the traditional state.
  • Devolution: central government grants increased autonomy to regions within the state (e.g., Scotland within the UK)
  • Centripetal forces: unify a state and strengthen its cohesion (shared language, national symbols, transportation networks)
  • Centrifugal forces: divide a state and weaken its cohesion (ethnic conflict, uneven development, separatist movements)
  • Supranationalism: states voluntarily give up some sovereignty to a larger organization (e.g., the European Union)

Electoral Geography and Gerrymandering

How voting districts are drawn can itself become a spatial political tool.
  • Gerrymandering: manipulating district boundaries for political advantage
  • 'Packing': concentrating opposition voters into one district to reduce their influence elsewhere
  • 'Cracking': splitting opposition voters across many districts so they can't form a majority anywhere
'Nation' and 'state' are NOT interchangeable on this exam — a nation is cultural identity, a state is the political/legal entity.
Devolution grants MORE autonomy to a region; it is a centrifugal force that can either relieve or encourage separatist pressure.

Agricultural Origins and Revolutions

Agriculture has undergone several major transformations that reshaped population and land use.
  • First Agricultural Revolution: domestication of plants and animals, shift from hunting/gathering to farming
  • Second Agricultural Revolution: mechanization and new techniques (crop rotation, seed drill) alongside the Industrial Revolution
  • Green Revolution: mid-20th-century spread of high-yield seeds, fertilizers, and irrigation to the developing world
  • Third Agricultural Revolution: biotechnology, GMOs, and precision farming

Von Thünen's Model

This model explains how distance from a market shapes what farmers choose to grow.
  • Land closer to the market is used for perishable or bulky/heavy goods (dairy, market gardening) due to high transport cost/urgency
  • Land farther from the market is used for goods that travel well or need more space (grain, then livestock ranching)
  • The model assumes an isolated state with a single market and uniform land — real-world transportation networks distort the rings

Subsistence vs. Commercial Agriculture

Farming systems differ in whether they aim to feed the farmer's household or to sell for profit.
  • Subsistence agriculture: grown primarily to feed the farmer's family, common in less developed regions
  • Commercial agriculture: grown for sale in a market, often large-scale and mechanized
  • Intensive agriculture: high input of labor/capital per unit of land (e.g., paddy rice farming)
  • Extensive agriculture: low input per unit of land, larger area (e.g., shifting cultivation, ranching)

Rural Settlement Patterns

The way rural populations arrange themselves on the landscape reflects history, land division, and farming type.
  • Dispersed settlement: farmsteads spread out, each surrounded by its own land (common in the U.S. Midwest)
  • Clustered settlement: farmhouses grouped closely, with farmland surrounding the cluster (common in parts of Europe)
  • Long-lot survey pattern: narrow lots stretching back from a river or road, giving each farm access to transportation/water
Von Thünen's rings order goods by transport cost and perishability relative to the market, not simply by how 'valuable' a crop is.
Intensive agriculture is about input per unit of AREA, not total farm size — a small, heavily worked plot can be intensive.

Urbanization and Site/Situation

Cities grow at locations chosen for their physical characteristics and their connections to other places.
  • Urbanization: the growing share of a population living in cities rather than rural areas
  • Site: the physical characteristics of a city's exact location (terrain, water access, resources)
  • Situation: a city's location relative to other places and transportation networks
  • Break-of-bulk point: a location where goods are transferred from one mode of transport to another, often spurring city growth (e.g., a port)

Models of Urban Structure

Several classic models describe how land use is organized within a city.
  • Concentric Zone Model (Burgess): the city grows outward in rings from a central business district (CBD)
  • Sector Model (Hoyt): land uses extend outward from the CBD in wedge-shaped sectors along transportation routes
  • Multiple Nuclei Model (Harris & Ullman): a city grows around several separate nodes/centers, not just one CBD
  • Galactic (Peripheral) City Model: a CBD is surrounded by suburban development and an outer beltway with edge cities

Urban Challenges

Rapid or uneven urban growth creates distinct spatial and social problems.
  • Urban sprawl: unplanned, low-density outward growth of a city into surrounding rural land
  • Redlining: historic discriminatory practice of denying services/loans to residents of certain neighborhoods, based on race
  • Gentrification: an influx of wealthier residents into a lower-income neighborhood, raising property values and often displacing original residents
  • Squatter settlements (informal settlements): unplanned housing areas, often lacking basic services, common on the edges of cities in less developed countries

Rank-Size Rule and Primate Cities

The relative sizes of a country's cities reveal something about its economic development and history.
  • Rank-size rule: a country's nth-largest city is approximately 1/n the population of its largest city — common in more developed countries
  • Primate city: a country's largest city that is disproportionately larger than all others, often dominating politics/culture/economy
  • Primate city distributions are common in less developed and formerly colonized countries
The Concentric Zone Model predicts rings; the Sector Model predicts wedges along transport lines — don't mix up which shape goes with which model.
A primate city being large doesn't automatically mean the whole country is highly urbanized — it can just mean urban population is unevenly concentrated.

Measuring Development

Geographers use multiple indicators, not just income, to compare how developed different countries are.
  • GDP/GNI per capita: economic output per person — a common but incomplete development measure
  • Human Development Index (HDI): combines life expectancy, education, and income into a single composite score
  • Gender Inequality Index (GII) and Gender Development Index (GDI): measure disparities between men and women in health, education, and economic participation
  • Core-periphery model (World Systems Theory): divides the world into wealthy 'core' countries, developing 'semi-periphery,' and less developed 'periphery' countries dependent on the core

Rostow's Stages of Growth

This model outlines a linear sequence countries pass through as they industrialize.
  • Traditional society: subsistence-based, little trade or industry
  • Preconditions for takeoff: early infrastructure and investment begin
  • Takeoff: rapid industrialization in a few leading sectors
  • Drive to maturity: industry diversifies and modernizes broadly
  • Age of high mass consumption: production shifts toward consumer goods and services

The Industrial Revolution and Its Diffusion

Industrialization began in one region and spread outward, reshaping global trade and migration.
  • The Industrial Revolution began in Great Britain in the late 1700s, tied to coal, steam power, and textile manufacturing
  • It diffused to continental Europe, North America, and eventually much of the world
  • Industrialization drove massive rural-to-urban migration as factory jobs pulled workers into cities

Globalization and Manufacturing Location

Modern industry is organized around global supply chains, and firms weigh several factors when choosing a location.
  • Break-of-bulk points and transportation costs still shape where factories locate, alongside labor cost and access to markets
  • Outsourcing/offshoring: shifting production to other countries, typically to reduce labor costs
  • Special Economic Zones (SEZs): areas with reduced regulation/tax incentives designed to attract foreign investment
  • Deindustrialization: the decline of manufacturing in a formerly industrial region (e.g., the U.S. 'Rust Belt'), often accompanied by job loss and population decline
Rostow's model is often criticized as too linear/Western-centric — know it as a model, not a guaranteed real-world path.
A high GDP per capita doesn't guarantee high HDI — a country can have high average income but weaker education/health outcomes, and vice versa.
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Unit 1: Thinking Geographically

Absolute Location
A place's exact position on Earth, typically given as coordinates (latitude/longitude) or an address.
Relative Location
A place's location described in relation to other places or features.
Formal Region
A region unified by one or more shared, official, or measurable traits (e.g., a country's borders).
Functional Region
A region organized around a central node or focal point, like a cell tower's signal area.
Absolute vs. relative location
Absolute: exact coordinates (latitude/longitude). Relative: position compared with other places.
Possibilism
The environment sets limits, but people choose how to respond to it.
Time-space compression
Shrinking of distance's effect as transport and communication speed up.
Geography
The study of where things are on Earth and why, for both people and the physical environment.
Graphics
Visual tools for spatial information: maps, graphs, charts, diagrams, photos.
Taxonomy
A system for classifying things into groups, such as types of regions or diffusion.
Natural environment
The physical world not made by people: climate, landforms, soil, water, vegetation.
Cultural environment
The natural environment as modified by people: farms, roads, buildings (cultural landscape).
Culture
Shared beliefs, values, language, customs, and material traits of a group.
Acculturation
Adopting some traits of another culture while keeping much of your own.
Holistic synthesis
Geography's whole-picture approach combining physical and human factors and many disciplines.
Environmental determinism
Discredited idea that the physical environment controls human behavior and development.
Map
A flat representation of part or all of Earth's surface; always simplified and distorted.
Cartography / cartographer
The science and art of mapmaking / the person who makes maps.
Reference maps
General maps showing locations of places and features (political, physical, topographic).
Political map
Reference map showing boundaries, capitals, and cities.
Physical map
Reference map showing natural features such as mountains, rivers, and elevation.
Topographic map
Reference map showing elevation with contour lines.
Thematic maps
Maps showing the spatial pattern of one topic or variable.
Isoline (isopleth) map
Lines connect points of equal value (temperature, pressure, elevation).
Choropleth map
Areas shaded by a data value; works best with rates.
Cartogram
Areas resized in proportion to a statistic such as population.
Map scale
Ratio of map distance to real distance; large scale = small area, more detail.
Mercator's map
Keeps shape and direction (navigation) but exaggerates area near the poles.
Latitude
Parallels measuring distance north or south of the equator, 0°–90°.
Longitude
Meridians measuring distance east or west of the Prime Meridian, 0°–180°.
International Date Line
About 180° longitude; crossing westward adds a day, eastward subtracts one.
Prime Meridian
0° longitude, through Greenwich, England.
Equator
0° latitude, dividing the Northern and Southern Hemispheres.
Greenwich Mean Time
Time at the Prime Meridian; the reference for world time zones (now UTC).
Time zones
24 zones about 15° of longitude wide, because Earth turns 15° per hour.
Equal area map
Projection that keeps relative area accurate but distorts shape.
Peters Projection map
Equal-area projection showing true continent sizes with stretched shapes.
Site
The physical characteristics of a place itself (harbor, hill, water supply).
Situation
A place's location relative to other places (trade routes, access).
Globalization
Increasing interconnection of economies, cultures, and people worldwide.
Vernacular region
A region defined by people's perceptions, with fuzzy borders ('the South').
Diffusion
The spread of a trait or idea from one place to others over time.
Relocation diffusion
Spread through people moving and carrying the trait with them.
Expansion diffusion
Spread outward from the hearth while staying strong there (contagious, hierarchical, stimulus).
Contagious diffusion
Rapid person-to-person spread through a population (viral video, disease).
Hierarchical diffusion
Spread from larger or more important places or people to smaller ones.
Stimulus diffusion
The idea spreads but the trait changes to fit the new culture (McAloo Tikki).
Hearth
The place where an idea or cultural trait originates.
Spatial distribution
How a phenomenon is arranged across space: density, concentration, pattern.
Density
How often something occurs per unit of area.
Arithmetic density
Total population ÷ total land area.
Physiological density
Total population ÷ arable land; shows pressure on farmland.
Agricultural density
Farmers ÷ arable land; high = little mechanization.
Concentration (clustered vs dispersed)
How spread out a feature is: clustered = close together; dispersed = far apart.
Pattern
The geometric arrangement of objects: linear, grid, random.
Arable land
Land suitable for growing crops (about 10% of Earth's land).
Census
An official population count; the U.S. holds one every 10 years.
Geographic information system (GIS)
Computer system that layers and analyzes geographic data.

Unit 2: Population and Migration Patterns and Processes

Physiological Density
Population divided by arable (farmable) land — reflects real pressure on food-producing land.
Demographic Transition Model
A model describing how birth and death rates change through five stages as a country develops.
Push Factor
A condition that drives people to leave a place, such as war or famine.
Pull Factor
A condition that attracts migrants to a destination, such as jobs or safety.
Rate of natural increase
Crude birth rate minus crude death rate (excludes migration).
Rule of 70
Doubling time ≈ 70 ÷ annual growth rate (%).
Epidemiologic transition
Shift in leading causes of death from infectious to chronic diseases as societies develop.
Refugee vs. IDP
Refugees flee across a border; internally displaced persons stay inside their own country.

Unit 3: Cultural Patterns and Processes

Hearth
The point of origin of a cultural trait or innovation.
Hierarchical Diffusion
Spread of a trait from places/people of power or influence downward to others.
Universalizing Religion
A religion that seeks converts everywhere and appeals to all people (e.g., Christianity, Islam).
Ethnic Religion
A religion tied to a specific ethnic group or place, which typically does not seek converts.
Contagious diffusion
Rapid person-to-person spread through a population, like a disease.
Stimulus diffusion
An underlying idea spreads but the specific trait changes.
Lingua franca
A shared language used between speakers of different languages.
Glocalization
Adapting a global product or idea to local culture.

Unit 4: Political Patterns and Processes

Nation-State
A state whose territory closely matches the cultural boundaries of a single nation.
Devolution
The transfer of increased autonomy from a central government to regional governments.
Superimposed Boundary
A boundary forcibly drawn over an existing cultural landscape, often ignoring it.
Gerrymandering
Manipulating electoral district boundaries for political advantage.
Unitary vs. federal state
Unitary: power concentrated nationally. Federal: power shared with regional governments.
Antecedent boundary
A border drawn before an area was heavily settled.
Irredentism
A state's claim to territory where its ethnic group lives in another state.
Supranationalism
States giving up some sovereignty to a larger body, like the EU.

Unit 5: Agricultural and Rural Land-Use Patterns and Processes

Von Thünen's Model
A model explaining how distance from a market shapes what crops/land uses surround it.
Subsistence Agriculture
Farming done mainly to feed the farmer's own household, not for sale.
Green Revolution
Mid-20th-century spread of high-yield seeds, fertilizer, and irrigation to developing regions.
Monoculture
Growing a single crop over a large area of land.
Second Agricultural Revolution
Mechanization and better techniques that coincided with the Industrial Revolution.
Shifting cultivation
Slash-and-burn farming in tropical areas; plots are abandoned as soil declines.
Agribusiness
Integration of farming with corporate processing, distribution and marketing.
Food desert
An area with poor access to affordable, nutritious food.

Unit 6: Cities and Urban Land-Use Patterns and Processes

Break-of-Bulk Point
A location where goods transfer between transport modes, often spurring city growth (e.g., a port).
Concentric Zone Model
Burgess's model describing a city growing outward in rings from a central business district.
Gentrification
An influx of wealthier residents into a lower-income neighborhood, often displacing existing residents.
Primate City
A country's largest city, disproportionately larger than all its other cities.
Site vs. situation
Site: physical characteristics of a place. Situation: its location relative to other places.
Sector model
Hoyt: wedge-shaped zones extending outward along transport routes.
Multiple-nuclei model
Harris & Ullman: a city grows around several separate centers.
Redlining
Denying loans or insurance in certain neighborhoods, often by race.

Unit 7: Industrial and Economic Development Patterns and Processes

Human Development Index (HDI)
A composite measure combining life expectancy, education, and income to rank development.
Rostow's Stages of Growth
A model describing a linear sequence of stages countries pass through while industrializing.
Outsourcing/Offshoring
Shifting production to another country, typically to reduce labor costs.
Deindustrialization
The decline of manufacturing in a formerly industrial region.
Sectors of the economy
Primary: extraction. Secondary: manufacturing. Tertiary: services. Quaternary: knowledge/information.
Weber's least cost theory
Industry locates to minimize transport, labor and agglomeration costs.
Special economic zone
Area with tax breaks and relaxed rules to attract foreign investment.
Sustainable development
Meeting present needs without compromising future generations.
Press 1–4 to answer · Enter for next

Unit 1: Thinking Geographically

What Geography Studies
Geography asks where things are, why they are there, and how places connect. It uses a few core ideas to describe both people and the land.
Environment, Culture & Acculturation
Every place is a mix of what nature provides and what people build. Culture is the bridge between the two.
Human-Environment Interaction
Geographers have long debated how much the environment shapes people and how much people shape the environment.
Maps & Cartography
Maps are the main tool of geography. Different maps are built for different jobs.
Thematic Maps
Thematic maps show data about one topic, such as population, income, or voting, rather than general locations.
Map Scale & Projections
Scale tells you how much the map is zoomed in; the projection tells you how the round Earth was flattened and what got distorted.
Location & the Global Grid
Location can be described exactly, with coordinates, or in relation to other places.
Time Zones & the Date Line
Because Earth rotates 360° in 24 hours, time changes by one hour for roughly every 15° of longitude.
Site, Situation & Globalization
Why a place grew where it did depends on its own features and on its connections to the rest of the world.
Types of Regions
A region is an area unified by one or more characteristics. AP Human Geography uses three types.
Diffusion & Hearths
Ideas, innovations, diseases, and cultural traits spread from where they start. The type of diffusion describes how they travel.
Spatial Distribution & Density
Distribution is how something is spread across space. Geographers measure it with density, concentration, and pattern.
Geographic Data
Geographers collect data from counts, surveys, satellites, and software to see spatial patterns.
Key fact
The 'five themes of geography' are location, place, human-environment interaction, movement, and region.
Key fact
Toponyms (place names) often reveal a location's settlement or cultural history.
Key fact
Remote sensing (satellites, aerial imagery) feeds much of the raw data used in GIS.
Key fact
Site describes a place's physical characteristics; situation describes its location relative to other places.
Key fact
Three densities: arithmetic (people ÷ land), physiological (people ÷ arable land), agricultural (farmers ÷ arable land).
Key fact
Expansion diffusion has three types: contagious, hierarchical, and stimulus; relocation diffusion moves with migrants.

Unit 2: Population and Migration Patterns and Processes

Population Distribution and Density
Population is distributed unevenly across the globe, concentrated in a few dense clusters.
The Demographic Transition Model (DTM)
The DTM describes how birth and death rates change as a country develops economically.
Population Pyramids
Age-sex population pyramids visualize a country's stage in the demographic transition.
Migration: Push and Pull Factors
Migration is driven by factors that push people away from a place and pull them toward another.
Key fact
Total Fertility Rate (TFR): average number of children a woman would have in her lifetime at current birth rates; ~2.1 is 'replacement level.'
Key fact
The demographic dividend is an economic growth boost that can occur in Stage 3, when the working-age population is unusually large relative to dependents.
Key fact
Refugees flee across an international border due to persecution or violence; internally displaced persons (IDPs) do not cross a border.
Key fact
Zelinsky's migration transition model links stages of mobility to a country's stage in the demographic transition.

Unit 3: Cultural Patterns and Processes

Culture, Cultural Traits, and Cultural Landscape
Culture is the shared beliefs, practices, and material objects of a group, expressed visibly on the landscape.
Cultural Diffusion
Cultural traits spread from their point of origin (hearth) outward through several distinct processes.
Language
Language distribution and diffusion is one of the clearest ways geographers trace cultural history.
Religion
Religions are classified by how they spread and how universal their appeal is intended to be.
Key fact
A hearth is the point of origin of a cultural trait or innovation.
Key fact
Ethnocentrism is judging another culture by the standards of one's own; cultural relativism is evaluating a culture by its own standards.
Key fact
Popular culture spreads rapidly and changes quickly (often via hierarchical/contagious diffusion); folk culture is tied to a small group and changes slowly.
Key fact
Syncretism: the blending of two or more cultural traits (often religious) into a new, combined form.

Unit 4: Political Patterns and Processes

States, Nations, and Sovereignty
Political geography distinguishes the legal entity of a state from the cultural identity of a nation.
Boundaries
Political boundaries are classified by how and when they were drawn relative to the cultural landscape.
Devolution and Supranationalism
Political power can shift both away from and beyond the traditional state.
Electoral Geography and Gerrymandering
How voting districts are drawn can itself become a spatial political tool.
Key fact
A landlocked state has no direct access to an ocean, which can limit trade options (e.g., Bolivia, Mongolia).
Key fact
An exclave is a piece of a state's territory separated from the main body by another state's territory (e.g., Kaliningrad).
Key fact
The heartland theory (Mackinder) argued that control of Eastern Europe/Central Asia was key to world domination.
Key fact
A multinational state contains more than one nation within its borders (e.g., the United Kingdom).

Unit 5: Agricultural and Rural Land-Use Patterns and Processes

Agricultural Origins and Revolutions
Agriculture has undergone several major transformations that reshaped population and land use.
Von Thünen's Model
This model explains how distance from a market shapes what farmers choose to grow.
Subsistence vs. Commercial Agriculture
Farming systems differ in whether they aim to feed the farmer's household or to sell for profit.
Rural Settlement Patterns
The way rural populations arrange themselves on the landscape reflects history, land division, and farming type.
Key fact
Monoculture: growing a single crop over a large area, which increases yield efficiency but raises vulnerability to disease/pests.
Key fact
The metes-and-bounds survey system uses natural landmarks and irregular boundaries; the township-and-range system uses a rectangular grid.
Key fact
Enclosure movement: the historical fencing off of communal land into privately owned plots, boosting agricultural efficiency.
Key fact
Aquaculture (fish farming) has grown rapidly as ocean fish stocks decline.

Unit 6: Cities and Urban Land-Use Patterns and Processes

Urbanization and Site/Situation
Cities grow at locations chosen for their physical characteristics and their connections to other places.
Models of Urban Structure
Several classic models describe how land use is organized within a city.
Urban Challenges
Rapid or uneven urban growth creates distinct spatial and social problems.
Rank-Size Rule and Primate Cities
The relative sizes of a country's cities reveal something about its economic development and history.
Key fact
A central place is a settlement that provides services to the surrounding population; central place theory (Christaller) predicts a hexagonal pattern of market areas.
Key fact
Range: the maximum distance people will travel to obtain a good/service; threshold: the minimum population needed to support that good/service.
Key fact
Suburbanization is often driven by 'white flight' and the growth of highway infrastructure in the mid-20th century United States.
Key fact
A megacity has a population over 10 million; a megalopolis is a chain of adjacent metropolitan areas that have grown together.

Unit 7: Industrial and Economic Development Patterns and Processes

Measuring Development
Geographers use multiple indicators, not just income, to compare how developed different countries are.
Rostow's Stages of Growth
This model outlines a linear sequence countries pass through as they industrialize.
The Industrial Revolution and Its Diffusion
Industrialization began in one region and spread outward, reshaping global trade and migration.
Globalization and Manufacturing Location
Modern industry is organized around global supply chains, and firms weigh several factors when choosing a location.
Key fact
Fair trade agreements aim to guarantee producers (often in less developed countries) a fair price for their goods.
Key fact
Microfinance/microloans provide small loans to entrepreneurs, often in developing regions, who lack access to traditional banking.
Key fact
Sustainable development balances economic growth with environmental protection and social equity.
Key fact
Dependency theory argues peripheral countries remain economically dependent on and exploited by core countries, limiting their development.
Common mistakes for each unit — read the mistake, then make sure you know why it's wrong.

Unit 1: Thinking Geographically

Watch out
Don't confuse absolute location (fixed coordinates) with relative location (context-dependent, can change).
Watch out
A 'large-scale' map is zoomed IN (shows a small area in detail) — this is the opposite of everyday usage of 'large.'
Watch out
Physiological density divides by arable land, not total land — don't mix it up with arithmetic density.
Watch out
Mercator keeps shape but distorts area; Peters (equal area) keeps area but distorts shape.
Watch out
Site is the place's own physical features; situation is its location relative to other places.

Unit 2: Population and Migration Patterns and Processes

Watch out
A country can have a high population (large total) but low density (spread thin) — India and Canada are useful contrasts here.
Watch out
Emigration is leaving a place; immigration is entering a place — from the perspective of the origin vs. the destination.

Unit 3: Cultural Patterns and Processes

Watch out
Don't confuse hierarchical diffusion (top-down, through influential nodes) with contagious diffusion (spreads to everyone nearby regardless of status).
Watch out
A universalizing religion isn't automatically the largest — ethnic religions like Hinduism can still have enormous populations.

Unit 4: Political Patterns and Processes

Watch out
'Nation' and 'state' are NOT interchangeable on this exam — a nation is cultural identity, a state is the political/legal entity.
Watch out
Devolution grants MORE autonomy to a region; it is a centrifugal force that can either relieve or encourage separatist pressure.

Unit 5: Agricultural and Rural Land-Use Patterns and Processes

Watch out
Von Thünen's rings order goods by transport cost and perishability relative to the market, not simply by how 'valuable' a crop is.
Watch out
Intensive agriculture is about input per unit of AREA, not total farm size — a small, heavily worked plot can be intensive.

Unit 6: Cities and Urban Land-Use Patterns and Processes

Watch out
The Concentric Zone Model predicts rings; the Sector Model predicts wedges along transport lines — don't mix up which shape goes with which model.
Watch out
A primate city being large doesn't automatically mean the whole country is highly urbanized — it can just mean urban population is unevenly concentrated.

Unit 7: Industrial and Economic Development Patterns and Processes

Watch out
Rostow's model is often criticized as too linear/Western-centric — know it as a model, not a guaranteed real-world path.
Watch out
A high GDP per capita doesn't guarantee high HDI — a country can have high average income but weaker education/health outcomes, and vice versa.