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Correction for the length of a Grain of Sand

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How long is 2.40 centimeters?
It's about nineteen times as long as a Grain of Sand
The length of a Grain of Sand is about 0.1250 centimeters.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.1250 centimeters. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 1,510 centimeters in height.
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