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| the process that breaks down rock and other substances at earth's surface. |
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| yhe movement of rock particles by wind, water, ice, or garvity. |
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| yhe type of weathering in wich rock is physically broken into smaller pieces |
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| rfers to the grinding away of 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 prcess that breaks down rock rock through chemical changes. |
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| means that a materal is full of tiny, connected air spaces that allow water to seep through it. |
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| means that a materal is full of tiny, connected air spaces that allow water to seep through it. |
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| the loose, whethered material on Earth's surface in wich plants can grow. |
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| the solid layer of rock beneath yhe soil. |
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| a dark-colored substance that formes 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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| usually consists of clay and other particles washed down from the A horizon, but little humus. |
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| as plants shed leaves, they form a loose layer. |
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| are 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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| one that is naturally replaced in arelativly short time. |
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| shown .on the map in figure 12, was an area where wind erosion coused severe loss of topsoil during the 1930s. |
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| the management of soil to prevent its destruction. |
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| the practice of plowing fields along the curve of a slope |
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