Today in class we talked about population pyramids. Population pyramids are used to analyze the growth or decline of fertility, mortality, and migration in cities. The three basic shapes for a population pyramid are the Christmas tree, the box, and the cup. The Christmas tree is used for developing nations because there are many children but not many elderly people. The box shape is when the number of elderly, children, and adults are some what even and is usually used in developed nations. The cup shape is for developed nations with negative growth, like lots of elderly people but not many children.
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