Population Pyramids

    Today in class we discussed population pyramids. Population pyramids are used to analyze growth growth (or decline) of fertility, mortality, and migration of cities. The 3 basic shapes of the pyramids are the Christmas tree, the box, and the cup. The Christmas tree represents developing nations. These graphs have slow growth rates, high birth rate, and a short life expectancy. Examples of countries that would have this graph are Namibia, and Bangladesh. The box represents a developed nation. These countries have low infant mortality rates, slow population growth, and a long life expectancy. Examples of this type of graph are Sweden and the United States. The cup represents a developed nation as well. The graphs show a low birth rate, shrinking population, and a long life expectancy. Examples of this graph are Italy and Japan. We also went through the whole slideshow again, and I got down some notes that I missed from last Monday and Tuesday. I saw things like the life expectancy definition, population growth percentages, and birth rates and death rates of countries.

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