| A | B |
|---|
| natural resource | a material that helps support life on Earth |
| renewable resource | a resource that can be replaced in a short time |
| nonrenewable resource | a resource that can't be used or replaced in a short period of time or at all |
| river | a natural stream of water flowing in one direction |
| lake | a body of fresh or salt water surrounded by land |
| estuary | an arm of the sea that expands towards land to meet the mouth of a river |
| tributary | a stream that flows into a larger body of water |
| Chesapeake Bay | the largest estuary in the United States |
| watershed | the area drained by a river or a river system |
| mineral | a naturally occuring substance, neither plant nor animal |
| aggreagate | a collection of loose materials, such as sand, pebbles and coal |
| arable land | land that is capable of producing crops |
