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913.490 feet is about 200,000 times as long as a Grain of Sand.
In other words, it's 223,000 times the length of a Grain of Sand, and the length of a Grain of Sand is 0.000004480 times that amount.
(medium grain)
Composed mainly of quartz, mica, feldspar, or magnetite, a grain of sand measures an average of 0.0041 feet. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 49.50 feet in height.
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