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| The process that breaks down rock and other substances at Earths surface. |
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| The movement of rock particals by wind,water, ice, or gravity. |
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| The type of weathering in which rock is physically broken into smaller pieces. |
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| The grinding away of rock by rock particals 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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| means that a material is full of tiny, connected air spaces that allow water to seep through it. |
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| a dark-colored substance that forms as plant and animal remains decay. |
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| the solid layer of rock beneath the soil |
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| the loose, weathered material on Earth's surface in which plants can grow. |
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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 it 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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| the b horizon that usually consists of clay and other particals washed down from the a horizon but little humus. |
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| as plants shed leaves they form a loose layer called _. |
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| as decompostion occurs, organisams that live in soil turn dead organic material into humus. |
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| the thick mass of tough roots at the surface of the soil. |
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| naturally replaced in a relatively short time. |
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| was an area where wind erosion caused severe loss of topsoil during the 1930s. |
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| the management of soil to prevent it's destruction. |
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| the practice of plowing fields along the curves of a slope. |
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| disturbs the soil and its plant cover as little as possible |
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