Weathering, Breaking down of rocks on earth's surface, Mechanical Weathering, Breaking apart rock of rocks without changing their chemical composition, Chemical Weathering, Breaking apart of rocks caused by a change in their chemical composition, Oxidation, Process in which minerals combine with oxygen to form new substances, Soil, Mixture of tiny pieces of weathered rock and remains of plants and animals, Topsoil, Top layer of soil, rich with oxygen and decayed organic matter, Subsoil, Layer of soil directly below topsoil, Erosion, Wearing away and moving of weathered rock and soil.

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