Match your vocabulary word to its definition.
1. emigration
2. immigration
3. migration
4. overpopulation
5. sustainable development
6. underpopulation
7. unsustainable development
8. urbanization
a. the number of people exceeds the available natural resources in an area
b. birth rate insufficient to replace the existing population
c. the movement from one place to another
d. the increase in the population of a city
e. resources being used up at a faster rate than they can be replenished
f. the ability to meet current needs without reducing the ability to meet future needs
g. leaving one's homeland to settle in a new place
h. the movement of people to a new country