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Custom Soil Resource Report <br /> Riser <br /> The vertical or steep side slope (e.g., escarpment) of terraces, flood-plain steps, <br /> or other stepped landforms; commonly a recurring part of a series of natural, <br /> steplike landforms, such as successive stream terraces. <br /> Road cut <br /> A sloping surface produced by mechanical means during road construction. It is <br /> commonly on the uphill side of the road. <br /> Rock fragments <br /> Rock or mineral fragments having a diameter of 2 millimeters or more; for <br /> example, pebbles, cobbles, stones, and boulders. <br /> Rock outcrop (map symbol) <br /> An exposure of bedrock at the surface of the earth. Not used where the named <br /> soils of the surrounding map unit are shallow over bedrock or where "Rock <br /> outcrop" is a named component of the map unit. <br /> Root zone <br /> The part of the soil that can be penetrated by plant roots. <br /> Runoff <br /> The precipitation discharged into stream channels from an area. The water that <br /> flows off the surface of the land without sinking into the soil is called surface <br /> runoff. Water that enters the soil before reaching surface streams is called <br /> ground-water runoff or seepage flow from ground water. <br /> Saline soil <br /> A soil containing soluble salts in an amount that impairs growth of plants. A <br /> saline soil does not contain excess exchangeable sodium. <br /> Saline spot (map symbol) <br /> An area where the surface layer has an electrical conductivity of 8 mmhos/cm <br /> more than the surface layer of the named soils in the surrounding map unit. The <br /> surface layer of the surrounding soils has an electrical conductivity of 2 <br /> mmhos/cm or less. <br /> Sand <br /> As a soil separate, individual rock or mineral fragments from 0.05 millimeter to <br /> 2.0 millimeters in diameter. Most sand grains consist of quartz. As a soil textural <br /> class, a soil that is 85 percent or more sand and not more than 10 percent clay. <br /> Sandstone <br /> Sedimentary rock containing dominantly sand-sized particles. <br /> 62 <br />