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Rock produced when a preexisting rock is subjected to high temperatures (which may cause it to melt partially), high pressures, chemically active fluids, or a combination of these agents. See rock cycle. Compare igneous rock, sedimentary rock.
See animal manure, green manure.
Zone of the earth's interior between its core and its crust. See lithosphere. Compare core, crust .
Soils containing a mixture of clay, sand, silt, and humus. Good for growing most crops.
Outer shell of the earth, composed of the crust and the rigid, outermost part of the mantle outside the asthenosphere; material found in earth's plates. See crust, mantle.
Process in which various chemicals in upper layers of soil are dissolved and carried to lower layers and, in some cases, to groundwater.
Method for reducing soil erosion that identifies easily erodible land that should not be planted in crops or cleared of vegetation.
See commercial inorganic fertilizer.
Downward movement of water through soil.
Rock formed when molten rock material (magma) wells up from the earth's interior, cools, and solidifies into rock masses. See rock cycle. Compare metamorphic rock, sedimentary rock.
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