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| Weathering is the processthat breaks downrock and other substace at Earth's surface. |
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Term
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| Mechanical weathering breaks down rock into pieces by freezing and thawing, release of pressure,growth of plants, and actions of animals. |
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| the term abrasion refers to the grinding away of rock particales carried by water, ice, wind, or gravity. |
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| Wedges of ice in rock widen and deepen cracks. This process is called ice wedging. |
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| Chemical weathering is the process that breacks down rock through chemical changes. |
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| Permeable means that a material is full of tinny, connected air spaces that allow water to seep through it. |
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Term
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| soil is the loose,weathered material on Earth's surface in witch plants can grow. |
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| Bedrock is the solid layer of rock beneath the soil. |
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| Humus is a dark-colored substace that froms as plant and animal remains decay. |
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| soil that is made up of about equal parts of clay,sand,and silt is called loam. |
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| Soil horizon is a layer of soil that differs in color and texure from the layers above or below it. |
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| the A horizon is made up of topsiol, a crumbly,dark brown soil that is a mixture ofhumus,clay,and other particals washed down from the A horizon,but little humus. |
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