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| the process that breaks down rock and other substances at Earth's surface |
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| the movement of rock particles by wind, water, ice, or gravity |
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| the type of weathering in which rock is physically broken into smalled pieces |
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| the grinding away of rock by rock particles carried by water, ice, wind, or gravity |
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| the process that splits rock when water seep into cracks, then freezes and expands |
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| the process that breaks down rock through chemical changes |
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| characteristic of materials such as sand and gravel that allow water to pass easily through them |
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| the loose, weathered material on Earth's surface in which plants can grow |
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| the solid layer of rock beneath the soil |
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| a dark-colored substance that forms as plant and animal remains decay |
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| soil that is made up of about equal parts of clay, sand, and silt |
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| a layer of soil that differs in color and texture from the layers above or below it |
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| a crumbly, dark brown soil that is a mixture of humus, clay and other minerals |
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| consists of clay and other particles washed down from the a horizon, but little humus |
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| plants shed leaves, they form a loose layer |
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| the organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals |
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| the thick mass of tough roots at the surface of the soil-kept the soil in place and held onto moisture |
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| naturally replaced in a relatively short time |
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| an area where wind euosion caused severe loss of topsoil during the 1930s |
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| the management of soil to prevent its destruction |
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| the process of plowing fields along the curves of a slope to prevent soil loss |
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| soil cnservation method in which the dead stalks from the previous year's crop are left in the ground to hold the soil in place |
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