| Term | Definition |
|---|---|
| Glacier | A large, thick sheet of slow-moving ice. |
| Volcano | A mountain made of lava, ash, or other materials from eruptions. |
| Earthquake | A shaking of Earth's surface that can cause land to rise and fall. |
| Flood | A large amount of water that covers normally dry land. |
| Plain | Flat land that spreads out a long way. |
| Weathering | The breaking down of rocks on Earth's surface into smaller pieces. |
| Plateau | A flat area higher than the land around it. |
| Erosion | The process of moving weathered rock and soil from one place to another. |
| Landform | A natural shape or feature on Earth's surface. |
| Canyon | A valley with steep sides. |
| Valley | The low land between mountains or hills. |
| Mountains | The highest kind of land, with sides that slope toward its top. |
