What is Population pyramid?
[[File:Angola population pyramid 2005.png|thumb|right|Expansive population pyramid of [[Angola]] for 2005 shows a young and rapidly growing population.]] [[File:China population pyramid 2005.png|thumb|right|Constrictive population pyramid of [[China]] for 2005 shows an older population that won't grow so much.]] 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 show the age distribution of the place, which can help in understanding and predicting the development of a country. There are three types of population pyramids: *Stationary pyramid shows a constant population, with equal [[birth rate]] and [[death rate]] *Expansive pyramid shows a growing population *Constrictive pyramid shows a shrinking population In this type of graph, a wide base means a very high birth rate and a narrow base means a low birth rate. {{-}} {{science-stub}} [[Category:Population]]