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Custom Soil Resource Report <br />Erosion (accelerated) <br />Erosion much more rapid than geologic erosion, mainly as a result of human or <br />animal activities or of a catastrophe in nature, such as a fire, that exposes the <br />surface. <br />Erosion (geologic) <br />Erosion caused by geologic processes acting over long geologic periods and <br />resulting in the wearing away of mountains and the building up of such landscape <br />features as flood plains and coastal plains. Synonym: natural erosion. <br />Erosion pavement <br />A surficial lag concentration or layer of gravel and other rock fragments that <br />remains on the soil surface after sheet or rill erosion or wind has removed the finer <br />soil particles and that tends to protect the underlying soil from further erosion. <br />Erosion surface <br />A land surface shaped by the action of erosion, especially by running water. <br />Escarpment <br />A relatively continuous and steep slope or cliff breaking the general continuity of <br />more gently sloping land surfaces and resulting from erosion or faulting. Most <br />commonly applied to cliffs produced by differential erosion. Synonym: scarp. <br />Escarpment, bedrock (map symbol) <br />A relatively continuous and steep slope or cliff, produced by erosion or faulting, <br />that breaks the general continuity of more gently sloping land surfaces. Exposed <br />material is hard or soft bedrock. <br />Escarpment, nonbedrock (map symbol) <br />A relatively continuous and steep slope or cliff, generally produced by erosion but <br />in some places produced by faulting, that breaks the continuity of more gently <br />sloping land surfaces. Exposed earthy material is nonsoil or very shallow soil. <br />Esker <br />A long, narrow, sinuous, steep -sided ridge of stratified sand and gravel deposited <br />as the bed of a stream flowing in an ice tunnel within or below the ice (subglacial) <br />or between ice walls on top of the ice of a wasting glacier and left behind as high <br />ground when the ice melted. Eskers range in length from less than a kilometer to <br />more than 160 kilometers and in height from 3 to 30 meters. <br />Extrusive rock <br />Igneous rock derived from deep-seated molten matter (magma) deposited and <br />cooled on the earth's surface. <br />Fallow <br />Cropland left idle in order to restore productivity through accumulation of moisture. <br />Summer fallow is common in regions of limited rainfall where cereal grain is grown. <br />30 <br />