population pyramids

Today in Human Geo, we talked about population pyramids. Population pyramids are used to analyze growth or decline in fertility, mortality, and migration. On the left side of the graph is males, and on the right side are females. The three basic shapes of population pyramids are shaped in a Christmas tree, a box, or a cup. The Christmas tree shows growth rates are slow and it most likely means they are developing nations including Africa. Christmas tree graphs show a high birth rate and a short life expectancy. A box shaped graph shows low infant mortality and is a developed nation. Since everything is most likely equal in a box graph, it means there is a slow population growth and long life expectancy. The final common shape is the cup and it is known for having an extremely low birth rate. They have a shrinking population which can cause damage for the future jobs and professions that will be needed. Cup graphs also are developed nations with long life expectancies.