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| is the process that breaks down rock and substances at Earths surface |
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| wedges of ice in rocks weden and deepen crack |
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| mechanical or physical weathering |
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Definition
| the type of weathering in which rock is physically broken into smaller pecies |
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| is the movement of rock particals by wind,water,ice or gravity |
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| grinding away rock by rock particals carried by water,ice,wind,or gravity |
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| is the process that breaks down rock through chemical changes |
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Definition
| a material is full of tiny, connected air spaces that allow water to seep through it |
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| is the loose,weathered material on Earths suface 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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Definition
| is a dark-colored substance that forms as plant and animal remains decay |
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| is 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 particals washed down from the A horizon ,but little humus |
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| the orgainisms that breack 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 suface of the soil-kept the soil in place and held onto mositure |
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| in one that is naturally replaced in a relatively short time |
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| manament of sil to prevent its destruction |
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| the practice of plowing fields along the curves of a slope |
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Definition
| as plants shed leaves,they form a loose layer called litter |
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| the soild layer of rock beneath the soil |
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| wind and erosion,combined with farming methods that were not suited to dry conditions |
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Definition
| disturbs the soil and its plant cover as little as possiable |
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