| A | B |
|---|
| abrasion | Grinding away of rock by rock or sand particles. |
| canyon | Deep, narrow valley with steep sides. |
| continental glacier | Ice sheet that covers a large area. |
| creep | Slow mass movement where gravity pulls soil downhill. |
| delta | Low, flat piece of land formed by deposition at the mouth of a river. |
| deposition | The process of dropping sediment in a new location. |
| erosion | Process of moving sediment from one place to another by wind, water or gravity. |
| flood plain | Flat area along the edge of a river formed by deposition during floods. |
| glacier | Thick sheet of ice formed when more snow falls in winter than melts in summer. |
| gravity | The force that pulls things toward Earth. |
| landforms | Physical features on Earth's surface. |
| mass movement | The downhill movement of rock and soil due to gravity. Mudslide, landslide, sinkhole. |
| meander | A looping change in direction of a river or stream. |
| oxbow lake | Crescent-shaped lake formed when a river gradually cuts through a meander. |
| sediment | Tiny particles of rock, soil and sand. |
| slope | The degree of change in elevation of land. |
| terminal moraine | Formed by melting continental glaciers that deposit long ridges of soil and rock. |
| tributary | River or stream that does not reach the ocean, instead it joins another river or stream. |
| valley | Long depression in Earth's surface that usually contains a river. |
| valley glacier | Found in high mountain valleys, form U-shaped valleys. |
| weathering | Process of breaking rock into sediment caused by wind, water or gravity. |
