P1U1 06Population Pyramids and Demographic Transition

Front

What is a population pyramid?

Back

A population pyramid is a visual representation of a population's structure, showing the distribution of males and females across different age groups. It functions as '2 sideways bar graphs' with males on the left and females on the right.

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What does the vertical axis represent in a population pyramid?

Back

The vertical axis represents age or year of birth.

Front

What does the horizontal axis represent in a population pyramid?

Back

The horizontal axis represents population size, which can be in thousands, millions, or as a percentage.

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What are population projections?

Back

Population projections are predictions about future population based on current trends in birth rates, death rates, and migration. They are used by governments for planning purposes.

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What is a baby boom?

Back

A baby boom is a marked increase in birth rates within a population, such as the one experienced in the USA after World War II.

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How is the Rate of Natural Increase calculated?

Back

The Rate of Natural Increase is calculated as the birth rate minus the death rate, expressed as a percentage. It represents the estimated rate of population growth without considering migration.

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What does a narrow shape at the top of a population pyramid indicate?

Back

A narrow shape at the top indicates a low proportion of people living into old age, often associated with a high death rate.

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What does a broad shape at the top of a population pyramid suggest?

Back

A broad shape at the top suggests a high proportion of people living longer.

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What does a wide base in a population pyramid indicate?

Back

A wide base indicates a large number of children and a high birth rate.

Front

What does a narrow base in a population pyramid show?

Back

A narrow base shows a small number of children and a low birth rate.