"breaking down rocks into small pieces", "weathering" "breaking down rocks into small pieces by hitting them or making them split (ex. sand blowing against rock)", "physical weathering" "breaking down rocks by chemicals in the air, water, or ground", "chemical weathering" "breaking down rocks caused plants, animals, or microbes", "biological weathering" "carrying away broken pieces of rock, often by wind, water, or ice", "erosion" "dropping off pieces of rock that were carried by wind, water, or ice", "deposition" "rotted plant and animal remains that becomes part of the soil", "humus" "any natural feature on Earth's surface", "landforms" "a flat stretch of land without any hills or mountains", "plain" "a low land between hills or mountains", "valley" "a deep, narrow landform with steep sides, usually with a river running through it", "canyon" "land built from pieces rock pieces dropped off at the end of a river", "delta" "a hill built from sand that is carried and dropped off by wind", "sand dune" "long, narrow land built up from sand dropped off shore", "barrier island" "a large moving sheet of ice", "glacier"
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