Correction for the length of a Grain of Sand
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How long is 494.20 yards?
It's about 350,000 times as long as a Grain of Sand
The length of a Grain of Sand is about 0.00137 yards.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.00137 yards. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 16.50 yards in height.