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| the chemical and physical process that break down rock at Earth's surface |
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| the process by which water, ice, wind, or gravity moves weathered rock or soil |
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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 other rock particles carried in water, ice, or wind |
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| process that splits rock when water seeps into cracks, then freezes and expands |
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| the process that breaks down rock through chemical changes |
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| a chemical change in which a substance combines with oxygen, as when iron oxidizes, forming rust |
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| characteristic of a material that is full of tiny, connected air spaces that water can seep through |
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| the loose, weathered material on Earth's surface in which plants can grow |
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| the layer of rock beneath the soil |
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| rich, fertile soil that is made up of about equal parts of clay, sand, and silt |
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| dark-colored organic material in soil |
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| the layer of soil that differs in color and texture from the layers above or below it |
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| mixture of humus, clay, and other minerals that forms the crumbly topmost layer of soil |
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| the layer of soil beneath the topsoil that contains mostly clay and other minerals |
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| the loose layer of dead plant leaves and stems on the surface of the soil |
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| soil organism that breaks down the remains of organisims and digests them |
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| a thick mass of grass roots and soil |
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| anything in the environment that humans use |
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| the area of the Great Plains where wind erosion caused soil loss during the 1930s |
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| the management of soil to prevent its destruction |
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| plowing fields along the curves of a slope to prevent soil loss |
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| soil conservation method in which the dead stalks from the previous year's crop are left in the ground to hold the soil in place |
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| the planting of different crops in a field each year to maintain the soil's fertility |
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