DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY DENNIS KUNKEL MICROSCOPY / SCIENCE PHOTO LIBRARY
Coloured scanning electron micrograph (SEM) of Beach sand contains both rock minerals and skeletons that have been derived from living organisms (such as coral). Note the sharp edges of the sand grains produced from rock while the sand grains produced from coral have fine holes and are smoother due to wearing down by the surface action. This sand came from Diamond Head Beach, Honolulu, Hawaii. Magnification: x10 when shortest axis printed at 25 millimetres.
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