DAVID SCHARF / SCIENCE PHOTO LIBRARY DAVID SCHARF / SCIENCE PHOTO LIBRARY
Sand grains. Coloured scanning electron micrograph (SEM) of rounded grains of sand. Sand is composed largely of the mineral quartz, and has particles which range in size from 0. Sand from desert regions, which is windblown, tends to be more rounded than marine sand, which is shaped by water movement. Magnification: x18 at 6x7cm size.
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