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Correction for the length of a Grain of Sand

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How long is 0.000405 milimeters?
It's about one-three-thousandth as long as a Grain of Sand
The length of a Grain of Sand is about 1.250 milimeters.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 1.25 mm. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15,100 milimeters in height.
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