Population Pyramids!

Today, in class we talked mostly on Population Pyramids. Population Pyramids are geographical drawings that shows the distribution of many age groups in a population.The three types or basic shapes of pyramids are known as the box, the christmas tree, and the cup. The christmas tree is what is known as a "developing nation". The growth rates are slow, it may have a high birth rate, and a short life expectancy. Some examples are places like Namibia and Bangladesh. The box is also a devloped nation but has slow growth as well. It also may have low infant mortality, slow population growth, and a long life expectancy, compared to the christmas tree. Some examples are places like the United States and Sweden. Finally, the cup is a fully developed nation; with a negative growth. Which my have a low birth rate, shrinking population, and a long life expectancy like the box example. Lastly, we reviwed and looked over some examples of Population Pyramids, figuring out why people are dying slower in this country versus another, why people are living longer, etc. That pretty much sums up the discussion of class today.