More about population pyramids

Today in human geo we watched a video about population pyramids and what they are used for. One of the ways they can be used is to show what a country's population will be like in the  future. Population pyramids show different age groups and depending on the size of each section you can tell if a population is growing, shrinking or will stay the same for many years. these sections are called pre-reproductive, reproductive, and post-reproductive. This also got us talking about the industrial revolution. Each country's population pyramid is different because some country's population is growing while others are shrinking. This also determines the shape of the pyramid. It can be a Christmas tree, a box, or a cup. Population pyramids also determine life expectancy based on whether you see a lot of people in the post-reproductive section of the pyramid.

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