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Loam (in geology and soil science) is soil composed mostly of sand (particle size > 63 um), silt (particle size > 2 um), and a smaller amount of clay (particle size < 2 um). By weight, its mineral composition is about 40-40-20% concentration of sand, silt and clay, respectively. These proportions can vary to a degree, however, and result in different types of loam soils: sandy loam, silty loam, clay loam, sandy clay loam, silty clay loam, and loam.

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