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Coprogenous earth (sedimentary peat) <br />A type of limnic layer composed predominantly of fecal material derived from <br />aquatic animals. <br />Corrosion (geomorphology) <br />A process of erosion whereby rocks and soil are removed or worn away by <br />natural chemical processes, especially by the solvent action of running water, <br />but also by other reactions, such as hydrolysis, hydration, carbonation, and <br />oxidation. <br />Corrosion (soil survey interpretations) <br />Soil-induced electrochemical or chemical action that dissolves or weakens <br />concrete or uncoated steel. <br />Cover crop <br />A close-growing crop grown primarily to improve and protect the soil between <br />periods of regular crop production, or a crop grown between trees and vines in <br />orchards and vineyards. <br />Crop residue management <br />Returning crop residue to the soil, which helps to maintain soil structure, <br />organic matter content, and fertility and helps to control erosion. <br />Cropping system <br />Growing crops according to a planned system of rotation and management <br />practices. <br />Cross-slope farming <br />Deliberately conducting farming operations on sloping farmland in such a way <br />that tillage is across the general slope. <br />Crown <br />The upper part of a tree or shrub, including the living branches and their foliage. <br />Cryoturbate <br />A mass of soil or other unconsolidated earthy material moved or disturbed by <br />frost action. It is typically coarser than the underlying material. <br />Cuesta <br />An asymmetric ridge capped by resistant rock layers of slight or moderate dip <br />(commonly less than 15 percent slopes); a type of homocline produced by <br />differential erosion of interbedded resistant and weak rocks. A cuesta has a <br />long, gentle slope on one side (dip slope) that roughly parallels the inclined <br />beds; on the other side, it has a relatively short and steep or clifflike slope <br />(scarp) that cuts through the tilted rocks. <br />Custom Soil Resource Report <br />33 Index #10