| A | B |
|---|
| Weathering | the breaking and changing of rocks |
| one way water causes weathering | water freezes in cracks in rocks, which causes breakage |
| another way water causes weathering | water flows over rocks and slowly wears it away |
| How can plants cause weathering | When plants grow in cracks and rocks, the growing roots cause the cracks to grow bigger. |
| Erosion | the moving of weathered rocks and soil by wind, water, or ice |
| Dune | a pile of sand formed by the wind. Wind blows sediments along with sand and deposits them in a pile. |
| Where is wind erosion especially noticeable? | In the desert |
| What does a glacier pick up as it moves down a mountain? | It picks up rocks and soil, moves them along, and pushes them across the land. |
| Name one way people can control erosion. | plant strips of grass and clover (cover crops) between crops |
| Name another way to control erosion. | Fields can be plowed in rows around hills. |
| Name a thrid way to control erosion. | Trees can be planted on steep hills. |
| How are glaciers formed? | Layers of snow build up when the snow does not melt in the summer. The pressure of the top layer causes bottom layer to become ice, and a glacier is formed. |
| How do glaciers cause erosion? | They slide slowly across the land and push rocks and soil with it. |
| What is a glacier? | large sheets of ice that can move downhill and rocks and soil move with them and in front of them. |
| sediments | sand and other tiny particles |
| recreational disturbance | vegetation is trampled causing the roots to break up and expose the soil. Vegetation is trampled by hikers, bikers, horse riders, and walkers |
