weathering - The breaking down of rock by wind water or ice , erosion - The movement of sediment from wind water or ice , depostion - The dropping off of sediment in a new location by wind water or ice , landform - A natural feature on Earths surface , canyon - A deep narrow valley with steep sides, formed by flowing water. , river delta - landform at the mouth of a river, where sediments deposit when the water slows down. , sand dune - A hill or mound of sand in the desert or beach. Formed by the wind. , U-shaped valley - A deep wide valley formed from the movement of a glacier ,

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