SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY SUSUMU NISHINAGA / SCIENCE PHOTO LIBRARY
Sand. Coloured scanning electron micrograph (SEM) of grains of sand. Sand is composed largely of quartz, and is produced by the weathering of quartz-containing rocks. Sand is defined as rock particles 0.05-2 millimetres in diameter. Magnification: x25 at 6x7cm size.
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