Measuring Population

Today in human geography we learned how to measure population. The crude birth rate is the number of births per 1000 of the population. As for the crude death rate, it's the same thing, the number of deaths per 1000 of the population. Rate of natural increase is produced by subtracting the death rate from the birth rate. That then gives us the natural growth rate, in percent form, for a country or region. But you can't forget about migration while measuring the population. Net Migration Rate is the number of persons leaving and entering the country at a time. That is written as a positive number. The excess of people leaving a country is emigration and that is written as a negative number. The reasons that people will leave a country is called push force. Some examples of push force are Civil War, environmental degradation, unemployment or underemployment, religious or ethnic persecution. When people are entering a country it has a pull force. Some examples of a pull force could be better economic opportunities, better health services, freedom of religion, and political freedom.