| A | B |
|---|
| emigrate | to move to another country |
| refugee | a person who flees to another country for refuge from persecution or disaster |
| population density | the average number of people living in a square mile or square kilometer |
| urbanization | tendency of a country's people to move from rural areas to cities |
| developed country | a country that is industrialized rather than agricultural |
| developing country | a country in the process of becoming industrialized |
| 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 |
