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0.0000000000000006250 megatonnes is about one-tenth as heavy as a Grain of Sand
In other words, it's 0.140 times the weight of a Grain of Sand, and the weight of a Grain of Sand is 7.10 times that amount.
(medium grain)
With tremendous variety in the size of grain and the component material, grains of sand weigh an average of 0.00000000000000440 megatonnes. In 2007, a team of seven in Myrtle Beach created the world's tallest sandcastle, which measured 15.10 m (49.55 ft) in height.
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