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- [[Image:Sand under electron microscope.jpg|thumb|right|300px|An electron micrograph showing grains of sand]] ...continental settings and non-[[tropical]] coastal settings, is [[silica]] (silicon dioxide, or SiO<sub>2</sub>), usually in the form of [[quartz]], which, bec7 KB (1,069 words) - 03:58, 6 April 2007
