Population pyramid
From Simple English Wikipedia, the free encyclopedia
A population pyramid is a graph. It has two back-to-back bars. These bars show the population in groups of ages, with woman in one side and man in the other side.
The pyramids usually show the development of a country. When you look a pyramid you can see the life conditions of the country.
There are three types of population pyramids:
- Stationary pyramid
- Expansive pyramid
- Constrictive pyramid