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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 />Custom Soil Resource Report <br />56 Index #10