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ch 11
Wheatering and Erosion
| Question | Answer |
|---|---|
| Weathering | A mechanical or chemical surface process that breaks down rocks into smaller piecces |
| mechanical weathering | breaks rocks into smaller pieeces without changing the them chemically |
| chemical weathering | when the chemical composition of rocks of rocks change |
| SOIL | THE MIXTURE OF WEATHERED ROCK, ORGANIC MATTER, WATER, AIR THAT SUPPORTS THE GROWTH OF PLANT LIFE |
| EROSION | wearing away andremoval of rocks or sidiiment |
| mass movement | when gravity alone causes rock or sediment to move down a slope |
| creep` | sediments move slowly downhill freezing and thawing occur as ice ,expanding it pushes sediments up then as soil th thaws sediments push further down |
| slump | mass of rock or sediment moves downhill, leaving a curved scar |
| deflation | the erosion by wind |
| abrasion | form of erosion that can make pits in rocks and produces smoth and polished surfaces |
| run-off | water that flows over Earths skurface |