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Asked by Jingsanlu123, New York, NY Fri Oct 11, 2013

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John Reeves -…, Agent, San Diego, CA
Fri Oct 11, 2013
Sand is a naturally occurring granular material composed of finely divided rock and mineral particles. The composition of sand is highly variable, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz. Sand is always used to the concrete block making machine.

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