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Custom Soil Resource Report <br />Mountain <br />A generic term for an elevated area of the land surface, rising more than 1,000 <br />feet (300 meters) above surrounding lowlands, commonly of restricted summit <br />area (relative to a plateau) and generally having steep sides. A mountain can <br />occur as a single, isolated mass or in a group forming a chain or range. Mountains <br />are formed primarily by tectonic activity and/or volcanic action but can also be <br />formed by differential erosion. <br />Muck <br />Dark, finely divided, well decomposed organic soil material. (See Sapric soil <br />material.) <br />Mucky peat <br />See Hemic soil material. <br />Mudstone <br />A blocky or massive, fine grained sedimentary rock in which the proportions of <br />clay and silt are approximately equal. Also, a general term for such material as <br />clay, silt, claystone, siltstone, shale, and argillite and that should be used only <br />when the amounts of clay and silt are not known or cannot be precisely identified. <br />Munsell notation <br />A designation of color by degrees of three simple variables —hue, value, and <br />chroma. For example, a notation of 10YR 6/4 is a color with hue of 10YR, value <br />of 6, and chroma of 4. <br />Natric horizon <br />A special kind of argillic horizon that contains enough exchangeable sodium to <br />have an adverse effect on the physical condition of the subsoil. <br />Neutral soil <br />A soil having a pH value of 6.6 to 7.3. (See Reaction, soil.) <br />Nodules <br />See Redoximorphic features. <br />Nose slope (geomorphology) <br />A geomorphic component of hills consisting of the projecting end (laterally convex <br />area) of a hillside. The overland waterflow is predominantly divergent. Nose <br />slopes consist dominantly of colluvium and slope -wash sediments (for example, <br />slope alluvium). <br />Nutrient, plant <br />Any element taken in by a plant essential to its growth. Plant nutrients are mainly <br />nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, manganese, <br />copper, boron, and zinc obtained from the soil and carbon, hydrogen, and oxygen <br />obtained from the air and water. <br />42 <br />