| A | B |
|---|
| population | the amount of people in a given area |
| population density | the average number of people living in a square mile or square kilometers |
| urbanization | the process of movement to the cities by people |
| famine | lack of food |
| birthrate | the number of children born each year for every 1,000 people |
| deathrate | the number of people out of every 1,000 who die in a year |
| better health care | a reason that the deathrate has declined |
| improved living conditions | a reason that explains why the deathrate has gone down. |
| population distribution | how people are spread out on usable land |
| finding jobs | the major reason people move to cities |
| fifty percent | the percentage of the world's people who live in cities |
| emigrate | leave a country where one is born and move to another |
| immigrate | comes into a new country to live |
| emigrant | someone who leaves a country |
| immigrant | someone who arrives in a new country |
| refugees | people who flee to another country to escape persecution or disaster |
