| A | B |
|---|
| emigrate | to move to another country |
| refugees | people forced to flee from their country for refuge from persecution, war, or disaster |
| population density | the average number of people living in a square mile or square kilometer |
| urbanization | people's movement to cities |
| demographer | scientist who studies population |
| birthrate | number of children born each year for every 1,000 people |
| death rate | number of deaths each year for every 1,000 people |
| famine | lack of food, affecting a large number of people |
| emigrants | people who leave their country to seek a better life in another country |
| jobs | most important reason people move to cities |
| food supply | famine often results when population increases much faster than |
| plentiful water | People prefer to live in places that have good land, a favorable climate, and...? |
| 6 billion | In 1999 the earth's population reached how many people? |
| immigrant | A person who has moved to a new country is known as a(n) __________ in the new country. |
