| A | B |
|---|
| death rate | the number of deaths per year for every 1,000 people |
| birthrate | the number of children born each year for every 1,000 people |
| famine | a severe lack of food |
| population density | the average number of people living in a square mile or square kilometer |
| urbanization | the growth of cities |
| emigrate | to leave the country where a person was born and move to another country |
| refugees | people who are forced to flee to another country to escape wars, persecution or disasters |
| technology | the application of scientific discoveries to practical use |
| internal | existing or taking place within or inside |
| immigrate | to move into a new country |
