Population+Key+Terms

1. Demography. The study of population numbers, distribution, trends, issues.  2. Rule of 70. Estimates the years needed for country's population to double. The formula is divide 70 by the population growth rate.  3. Natural Population Increase. This is the difference between birth and death rate.  4. Dependency Load. This is the population, aged under 14 and over 65 that is not in the work force.  5. Population Growth Rate. Measurement calculating overall growth of country's population. Combines natural increase and net migration.  6. Population Pyramid. Is a graph that shows population distribution by age and sex.  7. Migration. Is the movement of people in large numbers.  8. Doubling Time. Time required for country's population to double at current rate of population growth. See Rule of 70.  9. Population Density. How many people there are in a specific unit of area. 1000 people per square kilometer is very dense.  10. Population Distribution. Where the people of a country live, as in what part of the country.  11. Birth Rate-the number of births per 1000 people per year.  12. Death Rates-the number of deaths per 1000 people per year.

