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Soil <br />A natural, three-dimensional body at the earth’s surface. It is capable of <br />supporting plants and has properties resulting from the integrated effect of <br />climate and living matter acting on earthy parent material, as conditioned by <br />relief and by the passage of time. <br />Soil separates <br />Mineral particles less than 2 millimeters in equivalent diameter and ranging <br />between specified size limits. The names and sizes, in millimeters, of separates <br />recognized in the United States are as follows: <br />Very coarse sand: 2.0 to 1.0 <br />Coarse sand: 1.0 to 0.5 <br />Medium sand: 0.5 to 0.25 <br />Fine sand: 0.25 to 0.10 <br />Very fine sand: 0.10 to 0.05 <br />Silt: 0.05 to 0.002 <br />Clay: Less than 0.002 <br />Solum <br />The upper part of a soil profile, above the C horizon, in which the processes of <br />soil formation are active. The solum in soil consists of the A, E, and B horizons. <br />Generally, the characteristics of the material in these horizons are unlike those <br />of the material below the solum. The living roots and plant and animal activities <br />are largely confined to the solum. <br />Spoil area (map symbol) <br />A pile of earthy materials, either smoothed or uneven, resulting from human <br />activity. <br />Stone line <br />In a vertical cross section, a line formed by scattered fragments or a discrete <br />layer of angular and subangular rock fragments (commonly a gravel- or cobble- <br />sized lag concentration) that formerly was draped across a topographic surface <br />and was later buried by additional sediments. A stone line generally caps <br />material that was subject to weathering, soil formation, and erosion before <br />burial. Many stone lines seem to be buried erosion pavements, originally <br />formed by sheet and rill erosion across the land surface. <br />Stones <br />Rock fragments 10 to 24 inches (25 to 60 centimeters) in diameter if rounded or <br />15 to 24 inches (38 to 60 centimeters) in length if flat. <br />Stony <br />Refers to a soil containing stones in numbers that interfere with or prevent <br />tillage. <br />Custom Soil Resource Report <br />61 Index #10