erosion - the movement of sediments by water, wind, gravity, deposition - when sediment is left behind, u - shaped valley - a valley formed by a glacier, cave - groundwater erosion of limestone , sedimentary - this type of rock has layers, delta - deposits of sediments in a fan shape found at the end of rivers, v - shaped valley - a valley formed by a river, weathering - the breaking down of rock into small pieces, compaction - when layers of sediment are squished together , cementation - minerals seep into layers and "glue" them together, fossils - these are found in sedimentary rock and give clues to the past, oldest - The deepest layers of sediment have the ______ fossils.,

Changes to Earth's surface

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