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sand
A collection of rock particles with diameters in the range 0.125–2 mm. It can be graded according to particle size: fine (0.125--0.25 mm); medium (0.25–0.5 mm); coarse (0.5–1.0 mm); and very coarse (1–2 mm). Sands result from erosion by glaciers, winds, or ocean or other moving water. Their chief constituents are usually quartz and feldspar. See also sandstone.
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• GEOLOGY AND PLANETARY SCIENCE
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