| sand |
Particulate material resulting from rock disintegration, with no connotation as to composition. Sand ranges in diameter from 62.5 micrometers (very fine) to 2 millimeters (very coarse). Martian winds will move 160-micrometer particles more readily than any other size.
출처: www.lpi.usra.edu/publications/slidesets/winds/glos...
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| sand |
High grade, iron-free silica (sand) is required to make optical glass. Aeolian sand is considered one of the best types of sand for making optical glass. Other ingredients include calcite (for lime or calcium oxide), zinc oxide, lead oxide, soda ash, potassium nitrate, hydrated alumina, borax and boric acid.
출처: www.asap.unimelb.edu.au/bsparcs/guides/puzzles/omp...
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| sand |
course textured, granular soil
출처: shand.saskpower.com/greenhouse/education/project/g...
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| sand |
visible fragments of rock, most commonly quartz along the coast of SE Australian (P)
출처: www.vnc.qld.edu.au/enviro/flinders/land-defns.htm
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| sand |
Sand is the most common form of silica used in making glass. It is an impure silica, but should have a low content of iron and other impurities, should be washed and heated, and screened for uniformity of grain. Glass mythology holds that fires on the beaches of the Nile gave people the first indications of the possibily of making glass.
출처: www.guadalupeglass.com/Glossary.html
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