Today in human geography class we took a lot of notes. Life expectancy is the average number of years to be lived by a group of people born in the same year. You measure population by crude birth rate and crude death rate. Crude birth rate is the number of births per 1,000 of the population, and crude death rate is the number of deaths per 1,000 of the population. The rate of natural increase is produced by the difference of the death rate and birth rate, and it gives us the annual natural growth rate for a country or region. The net migration rate is the difference between the number of persons entering and leaving a country during a year.

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