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0.00000002950 megatonnes is about 6,500,000 times as heavy as a Grain of Sand
In other words, the weight of a Grain of Sand is 0.000000150 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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