how is sand madehow is it made

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  • The origin of the hourglass is unclear. Its predecessor the clepsydra, or water clock, may have been invented in ancient India. [citation needed] According to the

  • The term "sandpaper" is a misnomer, since most coated abrasives contain neither sand nor paper. Instead, a typical coated abrasive contains a backing

  • ensure that the sand and gravel meets those specifications. The Future The production of sand and gravel in many areas has come under increasingly stringent

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