Population Pyramids

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Today we started learning about population pyramids. Populations are divided into one side with men and one side with women. The men are on the left and the women are on the right. The pyramids start at the bottom with ages 0-4. The next level is ages 5-9, and so on until it gets to 100+. The pyramid is divided into 3 sections. Ages 0-14 are in the pre-reproductive years. Ages 15-55 are the reproductive years. Ages 45-100+ are the post reproductive years. If the pyramid looks like are true pyramid it means the population is growing very quickly. This happens in places that are pre-industrialized time. The pyramid looks like a diamond when the population is growing slowly (industrial). The pyramid will be very narrow at the bottom when the population is declining (post industrial).