an electron micrograph showing grains of sand
pitted sand grains western desert, egypt. pitting consequence of wind transportation.
the study of individual grains can reveal historical information origin , kind of transport of grain. quartz sand weathered granite or gneiss quartz crystals angular. called grus in geology or sharp sand in building trade preferred concrete, , in gardening used soil amendment loosen clay soils. sand transported long distances water or wind rounded, characteristic abrasion patterns on grain surface. desert sand typically rounded.
people collect sand hobby known arenophiles. organisms thrive in sandy environments psammophiles.
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