the movement of a mass of rock, debris, or earth down a slope. - Landslide, a slowly moving mass or river of ice formed by the accumulation and compaction of snow o9n mountains or near the poles. - Glacier, an overflowing of water onto land that is normally dry. - Flood, a mountain or hill with an opening and a magma chamber inside. - Volcano, breaking down of rock by water, wind, or ice. - Weathering, a barrier constructed to hold back water and raises its level  - Dam, an embankment to built to prevent the overflow of a river. - Levee, a hill of sand near an ocean or in a desert that is formed by wind. - Sand dunes, building a dam - Beavers, the movement of sediment. Water moves sediment to a new place. - Erosion, method of growing crops on the sides of hills or mountains by plant terraces built into a slope. - Terrace cultivation, an area of low, flat land shaped like a triangle, - Delta, a landform that rises high above its surrounding. Taller than a hill, it usually has steep sides and a rounded or sharp peak. - Mountain, a sudden and violent shaking of the ground, sometimes causing great destruction as a result of movements within the earth's crust. - Earthquakes, dropping sediment in a new place. When a a fast-moving river empties into a slower moving ocean. - Desposition,

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