| A | B |
|---|
| birth rate | the number of live births each year for every one thousand people in a population |
| carrying capacity | the maximum number of people that an area can sustain given space and resource limitations |
| death rate | the number of deaths each year for every one thousand people in a population |
| demographic transition | a way to describe a population's shift from high birth-death rates, to low birth-death rates |
| doubling time | the length of time that occurs before an area's population doubles in size |
| fertility rate | the number of live births per 1,000 women of child-bearing age (15-44), in a country |
| emigration | the process of people moving from one area to live in another |
| immigration | the process of people moving into an area from some place else |
| migration | the process of people, animals, plants, ideas, etc, moving or spreading from one area to others |
| natural increase | the number of people added to an area's population through live births |
| pull factors | circumstances or events in an area that attract people who do not live there to migrate to it |
| arithmetic population density | the average number of people who live in a given area of arable land (Typically a square mile or kilometer) |
| population pyramid | a double-sided bar graph which illustrates the age distribution between males and females in a population |
| push factors | circumstances or events in an area that force people to migrate to another area |
| refugees | a person who has been forced to leave an area - often suddenly, with no certain destination - due to man-made or natural disasters |
