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behind as high ground when the ice melted. Eskers range in length from less <br />than a kilometer to 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 <br />moisture. Summer fallow is common in regions of limited rainfall where cereal <br />grain is grown. The soil is tilled for at least one growing season for weed control <br />and decomposition of plant residue. <br />Fan remnant <br />A general term for landforms that are the remaining parts of older fan <br />landforms, such as alluvial fans, that have been either dissected or partially <br />buried. <br />Fertility, soil <br />The quality that enables a soil to provide plant nutrients, in adequate amounts <br />and in proper balance, for the growth of specified plants when light, moisture, <br />temperature, tilth, and other growth factors are favorable. <br />Fibric soil material (peat) <br />The least decomposed of all organic soil material. Peat contains a large amount <br />of well preserved fiber that is readily identifiable according to botanical origin. <br />Peat has the lowest bulk density and the highest water content at saturation of <br />all organic soil material. <br />Field moisture capacity <br />The moisture content of a soil, expressed as a percentage of the ovendry <br />weight, after the gravitational, or free, water has drained away; the field <br />moisture content 2 or 3 days after a soaking rain; also called normal field <br />capacity, normal moisture capacity, or capillary capacity. <br />Fill slope <br />A sloping surface consisting of excavated soil material from a road cut. It <br />commonly is on the downhill side of the road. <br />Fine textured soil <br />Sandy clay, silty clay, or clay. <br />Firebreak <br />An area cleared of flammable material to stop or help control creeping or <br />running fires. It also serves as a line from which to work and to facilitate the <br />movement of firefighters and equipment. Designated roads also serve as <br />firebreaks. <br />Custom Soil Resource Report <br />38 Index #10