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| the chemical and physical processes that break down rock at earth's surfaces |
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| the process by wich water,ice,wind, or gravity moves fragments of rock and soil. |
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| rock is physically broken into smaller pieces |
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| the grinding away of rock by rock particles carried by water, ice, wind, or gravity |
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| wedges of ice in rocks widen and deepen cracks |
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| the process that breaks down rock through chemical changes |
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| a material is full of tiny, connected air spaces that allow water to seep through it |
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| loose, weathered material on earths surface where plants can grow |
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| the soiled layer of rock beneath the soil |
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| dark-colored substance that forms as plant and animal remains |
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| soil that is made up of clay, sand,, and slit |
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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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| the A horizon crumbly, dark brown soil that is a mixture of humus, clay, and other minerals |
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| the B horizon usually consists of clay and other particles washed down from the A horizon, but little humus |
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| the loose layer as plants shed leaves |
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| organisms that break the remains of dead organisms into smaller pieces and digest them with chemicals |
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| thick mass of tough roots at the surface of the soil keeps the soil in place and holds onto moisture |
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| one that is naturally replaced in relatively short time |
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| an area where wind erosion caused severe loss of topsoil during the 1930's |
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| the managment of soil to prevent its destruction |
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| the practice of plowing the fields along the curves of a slope |
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| plowing the soil and plant cover as little as possible |
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