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6-11
Weathering and Erosion
| Question | Answer |
|---|---|
| a mechanical or chemical surface process that breaks rocks into smaller pieces | weathering |
| breaks rocks into smaller pieces without changing them chemically | mechanical weathering |
| occurs when the chemical composition of rock changes | chemical weathering |
| a mixture of weathered rock, organic matter, water, and air that supports the growth of plant life | soil |
| the surface features of an area | topography |
| the wearing away and removal of rock or sediment | erosion |
| when gravity alone causes rock or sediment to move in a downward slope | mass movement |
| process in which sediment moves slowly downhill | creep |
| occurs when a mass of rock or sediment moves downhill leaving a curved scar | slump |
| erosion of land occurs when wind blows across loose sediment and carries them away, often leaving behind particles too heavy to move | deflation |
| a silt left behind by deflation, very fine like talcum powder | loess |
| water that flows over Earth's surface | runoff |