| A | B |
|---|
| weathering | the breakdown of rock at or near the earth's surface into smalller and smaller pieces |
| chemical weathering | alters a rocks chemical make up by changing the minerals that form the rock |
| dust bowl | wind swept away across the Great Plain in great dust storms |
| moraines | accumalations of boulders, stones or other debris and deposited by glaciers |
| Ice Age | a cold period marked by eposides extensive glaciation alternating with episodes of relative warmth |
| mechanical weathering | breaks large masses of rock into even smaller pieces |
| acid rain | polluted air combined with water vapor and falls back to earth |
| sediment | small particles of soil, sand, and gravel |
| loess | a mineral-rich dust and silt |
| U shaped valley | glaciers carve out valleys that are rounded |
| V shaped valleys | rivers cut sharp sided |
| frost wedging | water freezes to ice in a crack in the rock |
| erosion | is the movement of weathered materials such as gravel,soil, and sand |
| delta | a triangular land form |
| glaciers | huge, slow moving sheets of ice |
| valley/alpine glaciers | found in the high valleys around the earth |
| continental glaciers/ice sheets | broad , flat (the glaciers that were in the ice age) |
| agents of erosion | agents of mechanical weathering |
