| A | B |
|---|
| air quality | the condition of the air based on the amount of pollution in it |
| aqueduct | a pipe or channel built to transport water from one place to another |
| basin | a bowl-shaped depression, or hollow, in Earth’s surface |
| communal land | land that is held in common by a group of people |
| estate | a sizable area of privately owned property with a large house |
| metropolitan area | a major population center made up of a large city and the smaller suburbs and towns that surround it |
| plaza | an open square or marketplace |
| pollution | damage to the natural environment caused by harmful substances; also refers to harmful substances |
| rural | found in or living in areas that are not close to cities |
| rural decline | worsening economic conditions in the countryside, including rising unemployment and growing poverty. Rural decline drives migration to cities. |
