AP Human Geography: Population Distribution, Density, and Composition

Vocabulary flashcards covering core concepts of population distribution, demographic density measurements, and population pyramid analysis.

Population Distribution

The spatial pattern of human settlement across the Earth, describing where people live.

Population Density

A measurement of the average number of people per square mile or kilometer of an area, indicating how crowded a place is.

Ecumene

A term used by geographers to designate permanently inhabited land.

Arithmetic Density

A measure of population density calculated by dividing a region's total population by its total land area.

Physiological Density

A measure of population density calculated by dividing a region's total population by its amount of arable land.

Arable Land

Land that is suitable and usable for growing agricultural crops.

Carrying Capacity

The maximum population size that a specific environment or region can support without significant environmental deterioration.

Agricultural Density

A measure comparing the number of farmers to the area of arable land, providing an indication of agricultural efficiency and labor intensity.

Redistricting

The redrawing of electoral district boundaries, mandated to occur every $10$ years to ensure districts have reasonably equal populations.

Population Composition

The demographic makeup of a population, including measurable characteristics such as age, sex, and ethnicity.

Population Pyramid

An age-sex composition graph based solely on age and sex data, used to study demographic history, project population changes, and predict markets.

Cohort

A specific age-group category represented on the vertical axis of a population pyramid, usually displayed in the center.

Birth Deficit

A slowdown or sharp decrease in births during wartime caused by the separation of couples or postponed family planning.

Baby Boom

A significant, sudden spike in birth rates that occurs once hostilities cease and peacetime conditions return, such as the post-WWII boom from $1946$ to $1965$.

Baby Bust

A period of declining birth rates following a baby boom that continues until the baby boom cohort reaches child-bearing age.

Echo (Demographic)

A secondary bulge in a population pyramid that occurs when a large baby boom generation reaches child-bearing age and has children.

Dependency Ratio (DR)

A demographic metric comparing the dependent population (individuals under $15$ and over $64$) to the potential working-age workforce (individuals aged $15$ to $64$).

Potential Workforce

The economically active segment of a population, defined demographically as individuals between the ages of $15$ and $64$.

Dependent Population

The nonworking portion of a population that relies on the workforce for economic support, comprising people younger than $15$ and older than $64$.