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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