sedimentary - a type of rock that forms in layers, fossil fuels - coal, oil, and natural gas, cementation - sediments hardening together by water and minerals, compaction - layers of sediment pressed together by natural forces, sediment - small pieces of rock, deposition - the dropping of sediment by wind, water, and ice, U-shaped valley - a valley that has a wide, flat bottom and steep sides.  Valley is formed by glaciers., V-shaped valley - A narrow valley with steep sides that lFlowing water slowly erodes the land, carving a deep, V-shaped valley.,

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