Help: Population Pyramids?

Question

What Are They ?

What Do They Show ?

How Are They Different Between Countries ?

Answer 1

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population pyramids are graphs usually showing the ages and sex of the population of a country or other political unit.

a classic pyramid will show largest part of the graph at the bottom (larger number of young people) and smallest portion at the top (smaller number of old people)

here are some links for images and information

http://www.fsl.orst.edu/pnwerc/wrb/Atlas_web_compr...

http://images.google.com/images?sourceid=navclient...

developing countries have larger young populations, so the pyramids are larger at the bottom

some more developed countries have growing older populations, so are larger at the top.

depending on the age brackets, and the age of the population in general, the pyramid can be largest in the middle of the pyramid, too.