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Gravel <br />Rounded or angular fragments of rock as much as 3 inches (2 millimeters to 7.6 <br />centimeters) in diameter. An individual piece is a pebble. <br />Gravel pit (map symbol) <br />An open excavation from which soil and underlying material have been <br />removed and used, without crushing, as a source of sand or gravel. <br />Gravelly soil material <br />Material that has 15 to 35 percent, by volume, rounded or angular rock <br />fragments, not prominently flattened, as much as 3 inches (7.6 centimeters) in <br />diameter. <br />Gravelly spot (map symbol) <br />A spot where the surface layer has more than 35 percent, by volume, rock <br />fragments that are mostly less than 3 inches in diameter in an area that has <br />less than 15 percent rock fragments. <br />Green manure crop (agronomy) <br />A soil-improving crop grown to be plowed under in an early stage of maturity or <br />soon after maturity. <br />Ground water <br />Water filling all the unblocked pores of the material below the water table. <br />Gully (map symbol) <br />A small, steep-sided channel caused by erosion and cut in unconsolidated <br />materials by concentrated but intermittent flow of water. The distinction between <br />a gully and a rill is one of depth. A gully generally is an obstacle to farm <br />machinery and is too deep to be obliterated by ordinary tillage whereas a rill is <br />of lesser depth and can be smoothed over by ordinary tillage. <br />Hard bedrock <br />Bedrock that cannot be excavated except by blasting or by the use of special <br />equipment that is not commonly used in construction. <br />Hard to reclaim <br />Reclamation is difficult after the removal of soil for construction and other uses. <br />Revegetation and erosion control are extremely difficult. <br />Hardpan <br />A hardened or cemented soil horizon, or layer. The soil material is sandy, loamy, <br />or clayey and is cemented by iron oxide, silica, calcium carbonate, or other <br />substance. <br />Custom Soil Resource Report <br />41 Index #10