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occur as a single, isolated mass or in a group forming a chain or range. <br />Mountains are formed primarily by tectonic activity and/or volcanic action but <br />can also be 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 <br />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 <br />convex area) of a hillside. The overland waterflow is predominantly divergent. <br />Nose slopes consist dominantly of colluvium and slope-wash sediments (for <br />example, slope alluvium). <br />Nutrient, plant <br />Any element taken in by a plant essential to its growth. Plant nutrients are <br />mainly nitrogen, phosphorus, potassium, calcium, magnesium, sulfur, iron, <br />manganese, copper, boron, and zinc obtained from the soil and carbon, <br />hydrogen, and oxygen obtained from the air and water. <br />Organic matter <br />Plant and animal residue in the soil in various stages of decomposition. The <br />content of organic matter in the surface layer is described as follows: <br />Custom Soil Resource Report <br />50 Index #10