| A | B |
|---|
| Mesa | A hill with a flat top or a small plateau with steep sides. |
| Crevasse | A deep crack in either the ice on top of a glacier or the ground after an earthquake. |
| Glacier | A thick sheet of ice and compacted snow covering a large area of land. |
| Desert | An area of dry land where few plants grow. |
| Dune | A mound or ridge of loose sand shaped by blowing winds. |
| Estuary | the wide part of a river's lower end, where it meets the tides of the sea. |
| Climate | The usual pattern of weather in a place. |
| Tundra | A huge, treeless plain bordering the Arctic Ocean. |
