population studies - population pyramids

+Population Pyramids

+What is it?

A type of graph that shows the distribution of various age groups in a population.

Different shapes can tell us if: A country is facing very high/low birth rates A country is suffering from growing/aging

population Indicates good/poor health and medical care Level of development

+General Structure

The left side of each pyramid shows the number of men in each age group

The right side shows the number of women

The longer the line, the more no. of people there are in that age group

+3 main shapes

Triangle Hexagon Cup

+TriangleDeveloping Country

Most countries in Africa

Widest btw 0 – 20 yrs old = High Birth Rates

Narrowest at > 60 yrs =Low life expectancy

+TriangleDeveloping Country

+HexagonDeveloped Country (Population still growing)

United StatesSingaporeCanadaUK

Widest btw 20 – 60 yrs old = Decreasing BRs

Broadening top = Increasing life expectancy

+HexagonDeveloped Country (Population still growing)

+Cup ShapedDeveloped Country (Population Aging)

JapanItalyGermany

Narrowest at the base = low birth rates

Widest at >60 yrs = Aging population

+Cup ShapedDeveloped Country (Population Aging)

Singapore1955 1980 2010

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