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| The slow downhill movement of soil and regolith. |
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A description of the way in which rocks weather
at different rates based on their texture and composition. |
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| The type of weathering caused by reducing pressure on a rocksurface, allowing slabs of the outer rock to break off in layers. |
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| When soil moves steadily and smoothly. These can move 1 mm toseveral meters a day. |
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| The mechanical breakup of rock caused by the expansion offreezing water in cracks and crevices. |
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| A dark organic material composed of partly decayed leaves andplants that add nutrients and water retaining ability to the soil. |
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| A red, highly leached soil type found in the tropics that is rich inoxides of iron and aluminum. |
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| The chemical process in which oxygen is combined with anotherelement or compound to form a different compound. (rusting) |
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| The underlying geologic material (usually bedrock) that thedifferent horizons of soil form in. |
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| The soil of humid regions characterized by the accumulation ofiron oxides and aluminum rich clays in the B horizon. (found in eastern US) |
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| Soil associated with drier regions and characterized by anaccumulation of calcium carbonate in the upper horizons. (found inwestern US) |
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| This occurs when rock or rock fragments fall freely through theair; common on steep slopes. |
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| A depression produced in a region where soluble rock has beenremoved by groundwater. |
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| A block of material that move along a flat inclined surface. |
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| The downward slipping of a mass of rock or unconsolidatedmaterial moving as a unit along a curved surface. |
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| When rocks are weathered to the point of havingrounded edges. |
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