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AP Human Geography · Concepts hub

AP Human Geography concepts & vocabulary — the master hub

AP Human Geography is a vocabulary exam at heart, and the models are where students gain or lose the most points. This hub indexes the highest-yield AP Human Geography vocabulary, from settlement models to population theory, each with a one-line definition and a link to a fuller guide.

Updated June 2026Models & terms

How to use this hub

Skim the grouped terms below to find the models you cannot yet explain in a sentence. AP Human Geography rewards naming a model and applying it to a scenario, so each definition is written to be usable, not just memorized.

When a model is fuzzy, open its guide for the assumptions, the diagram, and the traps that cost students points on the exam.

Settlement & economic models

The models that explain where people, services, and farms locate.

Central place theory
Christaller’s model of why settlements vary in size and spacing, built on threshold and range.
Von Thunen model
Concentric rings of agricultural land use around a market, set by transport cost and land rent.
Bid-rent theory
The idea that land value and use change with distance from a central business district.

Population & development

How population changes as a country develops.

Demographic transition model
Five stages of birth and death rates that track a country from pre-industrial to post-industrial.
Population pyramid
A graph of age and sex structure that reveals growth rate and dependency.
Carrying capacity
The largest population an environment can support with its resources.

Culture & diffusion

How ideas, people, and innovations spread across space.

Diffusion
The spread of a phenomenon across space and time, by relocation or expansion.
Relocation vs expansion
Whether something spreads by physically moving or by radiating outward from a source.
Hierarchical diffusion
Spread through a chain of key people or places, such as big cities, rather than evenly.

How AP Human Geography tests models

Multiple-choice questions usually hand you a scenario, a map, or a graph and ask which model or term it demonstrates. Knowing a flashcard definition is not enough; you have to recognize the model in an unfamiliar setting.

The free-response questions reward applying a model to a specific place or situation. Practice writing one tight sentence that names the model and ties it to a concrete example.

Frequently asked questions

Quick answers, written by humans.

How much vocabulary does AP Human Geography have?

A lot. The course is built around models and terms, and most multiple-choice questions test whether you can recognize a concept in a scenario. Learning each term with an example is the highest-leverage thing you can do.

Which AP HuG models show up most?

Central place theory, the Von Thunen model, the demographic transition model, and the types of diffusion are among the most frequently tested. The migration and population units lean on them heavily.

What is the best way to memorize AP HuG models?

Pair each model with a real example and a quick sketch of its diagram. Recognizing the model in an unfamiliar place, which is what the exam asks, comes from examples, not bare definitions.

Concept guides

Open a model.

Related

Keep going.

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