AP Human Geography: Population Dynamics, Composition, Distribution, and Theories

Comprehensive review flashcards covering population distribution, composition, demographic transitions, epidemiological stages, and Malthusian versus cornucopian theories.

According to Thomas Robert Malthus, at what mathematical rates do human population and food production grow?

Population grows geometrically or exponentially (e.g., from $2$ to $4$, to $8$, to $16$), whereas food production grows arithmetically (e.g., from $2$ to $3$, to $4$, to $5$).

In Malthusian theory, what is the distinction between positive checks and preventive (negative) checks?

Positive checks reduce population by increasing premature death through famine, disease, and war; preventive checks lower birth rates through celibacy, delayed marriage, moral restraint, abortion, and birth control.

What dire prediction did biologist Paul R. Ehrlich make in his 1968 book, The Population Bomb?

He declared that the battle to feed humanity was over and predicted that hundreds of millions of people would starve to death within a decade.

How did Karl Marx and Friedrich Engels critique the Malthusian explanation of starvation and poverty?

They argued that starvation, disease, and poverty stem from the unequal distribution of wealth in capitalist society, rather than from overpopulation.

What is the Boserup effect, formulated by Danish economist Ester Boserup?

The increase in food production that occurs when the pressure of feeding a larger population stimulates people to adopt more intensive farming methods and new agricultural technologies.

Why did cornucopian Julian Simon describe human beings as the "ultimate resource" in his 1981 book?

He argued that population growth provides more brainpower to invent new technologies and discover resource substitutes, leaving society better off.

Which foreign country is the largest exporter of crude oil to the United States, providing $38\%$ of its imports?

Canada.

Who formulated the demographic transition model (DTM) in 1945, and what historical data was it based on?

American demographer Frank Notestein formulated the model (building on Warren Thompson's 1929 concept), based on the historical experiences of northern European countries.

What characterizes Stage 1 (High Stationary Stage) of the demographic transition model?

Crude birth rates and crude death rates are both high, resulting in slow or fluctuating population growth with no long-term natural increase; no country is currently in Stage 1.

What demographic condition marks the transition from Stage 4 to Stage 5 in the demographic transition model?

The crude death rate outpaces the crude birth rate, and the total fertility rate drops below replacement level, causing natural population decrease.

Why is China considered an example of an accelerated demographic transition rather than a traditional progression?

Strict birth control policies, particularly the "one couple, one child" policy enacted in 1979, caused fertility to decline rapidly and fast-forwarded China into Stage 4 before it had fully industrialized.

What are the three primary phases of Abdel Omran's epidemiological transition theory?

(1) The age of pestilence and famine, (2) the age of receding pandemics, and (3) the age of degenerative and human-made diseases.

What shift in causes of death distinguishes the age of receding pandemics from the age of degenerative and human-made diseases?

Mortality shifts from infectious, parasitic, and nutritional diseases that disproportionately kill infants and children to chronic, degenerative diseases (such as cancer, heart disease, and stroke) that kill older adults.

What is the demographic accounting equation used to determine total population change at the end of a given period?

$$\text{Population at end of period} = \text{Beginning population} + \text{Total births} + \text{Total in-migrants} - \text{Total deaths} - \text{Total out-migrants}$$

Who was declared by the United Nations to be the world's seven-billionth person, and on what date was she born?

Danica Camacho, born on October 30, 2011, in Manila, Philippines.

What crude birth rate (CBR) values define low, transitional, and high birth rate tiers?

Low birth rate is between $10$ and $20$ per $1000$; transitional is between $20$ and $30$ per $1000$; high birth rate is more than $30$ births per $1000$ people.

What is replacement level fertility, and what total fertility rate (TFR) value represents it?

The average number of children needed per woman to replace both parents and stabilize the population over time, which corresponds to a TFR of $2.1$.

Why is the infant mortality rate (IMR) regarded as the single best indicator of a society's living standards?

Because it reflects a broad range of living conditions, including nutrition, public sanitation, clean water, maternal health, education, housing, and access to medical care.

How is the rate of natural increase (RNI) calculated from the crude birth rate (CBR) and crude death rate (CDR)?

Subtract CDR from CBR and divide the resulting difference by $10$ to yield a percentage: $\text{RNI} = \frac{\text{CBR} - \text{CDR}}{10}$.

How is doubling time calculated using the rule of 70?

Divide $70$ by the country's annual rate of natural increase: $\text{Doubling time} = \frac{70}{\text{RNI}}$.

How is a country's age dependency ratio calculated?

Divide the number of dependents (ages $0-14$ plus ages $65+$) by the working-age population (ages $15-64$) and multiply by $100$.

What characterizes the "double dependency" category defined by the Population Reference Bureau?

A moderate youth dependency ratio of $29\%$ to $45\%$ combined with a high elderly dependency ratio of $15\%$ or higher.

What birth years and population size define Generation Y (millennials) in the United States?

Born between 1981 and 2000, comprising approximately $83$ million individuals, making it the largest generation in the United States.

What is androcentrism, and how has it influenced sex ratios in countries like China?

A cultural preference for males over females, which led to gender-selective abortions and infanticide, resulting in China's skewed ratio of $121.2$ boys per $100$ girls at birth in 2004.

Why does the population pyramid of Oman exhibit an extreme bulge on the male side between ages 20 and 45?

Due to gender-selective immigration consisting predominantly of foreign male guest workers brought in to fulfill labor needs.

What visual shapes characterize the population pyramids of rapidly growing versus declining populations?

Rapid growth produces a wide base that tapers steeply to a narrow top (stepped pyramid); declining growth produces a narrow base that appears top-heavy.

What proportion of the global human population lives within the Northern Hemisphere and between $30^\circ$ and $60^\circ$ latitude?

Approximately $6.8$ billion of the world's population lives in the Northern Hemisphere, with roughly two-thirds situated in the middle latitudes between $30^\circ$ and $60^\circ$.

What is the ecumene?

The portion of Earth's surface with permanent human settlement.

What are the world's four major population clusters?

South Asia, East Asia, Europe, and Southeast Asia.

How are the rankings of the top three most populous countries projected to change between 2018 and 2050?

India will move from #2 to #1 ($1680$ million), China will fall from #1 to #2 ($1344$ million), and Nigeria will rise from #7 to #3 ($411$ million).

Near what location was the mean center of the United States population located in the 2010 census?

Near the town of Plato, Missouri, after moving steadily west from 1790 to 1920 and southwest since 1920.

How is physiological density calculated, and what does it measure?

Dividing total population by the area of arable land; it measures the pressure exerted by the human population on land suitable for cultivation.

How is agricultural density calculated, and what does it indicate about a society's economy?

Dividing the total number of farmers by the total area of arable land; high density reflects labor-intensive farming with muscle power, while low density indicates mechanized agriculture.

Why is Egypt's physiological density ($8881\,\text{persons per square mile}$) so much greater than its arithmetic density ($249\,\text{persons per square mile}$)?

Because less than $3\%$ of Egypt's total land area is arable, forcing nearly the entire population to concentrate along the Nile River Valley.

How does demographic shifting from the Snow Belt to the Sunbelt impact representation in the United States House of Representatives?

Every $10$ years, the $435$ seats are reapportioned based on census data, causing Sunbelt states to gain seats while Northeast and Midwest Snow Belt states lose seats.