| A | B |
|---|
| landforms | natural features of the earth's land surface |
| elevation | height above sea level |
| mantle | made up mostly of hot, solid rock |
| tectonic plates | slow moving sections of the earth |
| continental drift | movement of tectonic plates |
| erosion | wearing away by wind, water, and ice |
| glaciers | great ice sheets |
| river system | waterways that empty into another body of water |
| climate | pattern of weather of a place |
| latitude | distance north or south of the equator |
| tropical zone | area between the Tropic of Cancer and the Tropic of Capricorn |
| temperate | area between Tropic of Cancer and the Arctic Circle and between the Tropic of Capricorn and the Antarctic Circle |
| polar zone | area north of the Arctic Circle and south of the Antarctic Circle |
| prevailing winds | winds that blow from a certain direction almost all the time |
| ocean current | ocean water that flows in a steady stream |
| precipitation | the falling of moisture such as rain or snow |
| projection | ways of representing earth on a flat surface |
| natural resources | materials found in nature |
| minerals | nonliving substances found beneath the earth's surface |
| renewable resources | resources that can be replaced as they are used |
| nonrenewable resources | resources that cannot be replaced as they are used |
| fossil fuel | (coal, oil, natural gas) provides the energy needed to heat homes and power machines |
