| A | B |
|---|
| demography | study of human populations |
| age structure | distribution of ages in a specific population |
| survivorship | percentage of members of a group that are likely to survive to any given age |
| fertility rate | number of babies born each year per 1,000 women in a population |
| migration | movement of individuals between areas |
| immigration | movement into an area |
| emigration | movement out of an area |
| life expectancy | average number of years a person is likely to live |
| demographic transition | model that decribes how these changes can occur |
| infrastructure | basic facilities and services that support a community |
| arable land | land that can be used to grow crops |
| urbanization | more people living in cities than in rural areas |
| problems of rapid growth | shortage of fuelwood, unsafe wtaer, impacts on land |
