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Custom Soil Resource Report <br /> 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 /> 39 <br />