| A | B |
|---|
| contiguous | areas that are joined together inside a common boundary |
| megalopolis | pattern of heavy urban settlement over a large area |
| coral reef | structure at or near the water's surface formed by the skeletons of small sea animals |
| free enterprise system | economic system in which people start and run businesses with limited government intervention |
| service industry | businesses that provide services to people instead of producing goods |
| navigable | body of water wide and deep enough to allow the passage of ships |
| fossil fuel | coal, oil or natural gas |
| acid rain | rain containing high amounts of chemical pollutants |
| landfill | area where trash companies dump the waste they collect |
| recycling | reusing materials instead of throwing them out |
| free trade | removing trade barriers so that goods flow freely among countries |
| colony | overseas territory or settlement tied to a parent country |
| representative democracy | government in which the people are represented by elected leaders |
| federal republic | government divided between national and state powers |
| secede | to withdraw from a national government |
| immigrant | person who moves to a new country to make a permanent home |
| rural | area in the countryside |
| urban | area in the city |
| suburb | smaller community that surrounds a city |
