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Custom Soil Resource Report <br /> 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 /> 47 <br />