| A | B |
|---|
| weathering | is the break down of rock at or near the earths surface into smaller and smaller pieces. |
| chemical weathering | the procesws that alters a rocks chemical make up by changing the minerals that form the rock or combining them with new chemical elements. |
| agents of erosion | weathering, water, wind and glaciers |
| dust bowl | when fertile soil blows away from the plant life is stripped and exposed to wind |
| moraines | when glaciers melt and receed in some places , they leave behind rifge like piles of rock and debris called |
| ice age | a long term period of time in which has cold tempertaures and glaciers cover most of the world. |
| mechanical weathering | when a rock is broken or weakened physically |
| acid rain | when chemicals in the polluted air combine with water vapor and fall back to earth as |
| sediment | small particles of soil, sand and gravel that get carried by water |
| loess | the wind blown deposits of mineral rich dust and silt |
| U-shaped valleys | valleys that are rounded |
| continental glaciers/ice sheets | broad flat glaciers that occur in the ice age that cover |
| frost wedging | the process in which water freezes to ice in cracks of the rock then expands and breaks apart the ice |
| erosion | is the movement of weathered materials such as gravel, soil and sand |
| delta | a flat low lying plain that is sometimes formed at the mouth of a river when sediment settles. |
| glaciers | huge slow moving sheets of ice |
| V-shaped valleys | sharp sided valleys |
| valley/alpine glaciers | the opposite of continental glaciers found all ofver the world that are high |
