AP Human Geography Flashcards: Population Distribution
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Review key ideas with interactive flashcards. This set includes 11 cards to help you master important concepts.
A country has a high physiological density but a low arithmetic density. What does this imply?
This implies that the country has a small percentage of arable land, meaning its population is concentrated on the limited land available for farming.
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A country has a high physiological density but a low arithmetic density. What does this imply?
This implies that the country has a small percentage of arable land, meaning its population is concentrated on the limited land available for farming.
What are the two main categories of factors that influence population distribution?
The two main categories are physical factors, such as climate and landforms, and human factors, such as culture, economics, history, and politics.
Define arithmetic density.
Arithmetic density is the total number of people divided by the total land area. It shows the average number of people per unit of land.
Define physiological density.
Physiological density is the number of people per unit of arable (farmable) land. It reveals the pressure a population exerts on its ability to produce food.
List three examples of physical factors that influence population distribution.
Physical factors that influence where populations settle include climate, the shape of the land (landforms), and the proximity to water bodies.
What are the three methods geographers use to calculate population density?
The three methods used to calculate population density are arithmetic, physiological, and agricultural.
List three examples of human factors that influence population distribution.
Human factors that influence where populations settle include cultural preferences, economic opportunities, historical settlement patterns, and political stability.
What is the primary difference in the information revealed by the three methods of calculating population density?
Each method reveals different information about the pressure the population exerts on the land, whether it's overall land, farmable land, or the agricultural workforce.
Which method of calculating population density is most useful for understanding the strain on a country's food supply?
Physiological density is the most useful method because it directly compares the number of people to the amount of land available to grow food.
How does the scale of analysis affect the study of population distribution?
The factors that explain patterns of population distribution change depending on the scale of analysis (e.g., local, national, or global).
Define agricultural density.
Agricultural density is the ratio of the number of farmers to the amount of arable land. It helps geographers understand the efficiency of a region's agriculture.