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0.0013 kilometers is about 1,000 times as long as a Grain of Sand.
In other words, it's 1,040 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.000962 times that amount.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.000001250 kilometers. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 0.0151 kilometers in height.
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