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| is the process that breaks down rock and other substances at earths surface |
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| the type of weathering in wich 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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| is the process that breaks down rock through chemical change |
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| is the loose weathered material on earths surface in witch plants can grow |
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| is the solid layer of rock beneath the soil |
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| is a dark colored substance that forms as plant and animal remains decay |
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| soil that is made up of about equel parts of clay,sand,and silt |
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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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| usually consists of clay and other particals washed down from the a horizon but little humus |
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| are the organisms that break the remins 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 the moisture |
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| is one that is naturally replaced in a relativly short time |
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| was and area where wind erosion caused severe loss of top soil during the 1930's |
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| is the management of soil to prevent its distruction |
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| is 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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| the process by witch water,ice,wind,or gravity moves fragment of rock and soil. |
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| characteristic of materials such as sand and gravel that allow water to pass easily through them. |
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| as plant shed leaves they form a loose layer |
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| a crumbly,dark brown soil that is a mixture of humus,clay,and other materials |
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| factors that cause mechanical weathering are |
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| release of pressure,freezing and thawing,plant growth,abrasion,animal actions |
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| three causes of chemical weathering are |
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| acid rain,living organisms,carbon dioxide |
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| factor that effect the rate of weathering are |
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| chemical weathering occures faster in hot,wet climates than in cold dry climates |
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| because rainfall provides the water needed for chemical change as well as for freezing and thawing,chemical reaction occure faster at high tempsthat is why chemical weathering occures more quickly were the climate is both hot and wet. |
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