| A | B |
|---|
| gross national product | The total value of a nation's goods and services, Including the output of domestic firms in foreign countries and excluding the domestic output of a foreign firms |
| canal | An artificial waterway |
| telecommunication | Communication by electronic means |
| free enterprise | An economic system that allows individuals to own, operate, and profit from their own businesses in an open, competitive market |
| metropolitan area | A major city and its surrounding suburbs |
| hierarchy | Rank according to function |
| hinterland | The area served by a metropolis |
| megalopolis | A very large city; a region made of several large cities and their surrounding areas, considered to be a single urban complex |
| mangrove | A tropical tree that grows in swampy ground along coastal areas |
| bayou | A marshy inlet or outlet of a lake or a river |
| fall line | Imaginary line between the Appalachian Mountains and the Atlantic coastal plain, where rivers and streams form waterfalls and rapids as they descend from higher elevations to the coastal plain |
| Sunbelt | The southern and southwestern states of the United States, from the Carolinas to southern California, characterized by a warm climate and recently, rapid population growth |
| humus | The organic material that results when plants and animals that live in the soil die and decay |
| growing season | In farming, the average number of days between the last frost of spring and the first frost of fall |
| grain elevator | A tall building equipped with machinery for loading, cleaning, storing, and discharging grain |
| grain exchange | A place where grain is bought and sold as a commodity |
| tundra | A region where temperatures are always cool or cold and only specialized plants can grow |
| aqueduct | A large pipe or channel designed to transport water from a remote source over long-distance |
