A gallon of water is estimated to weigh 8.34 pounds. 21 tons divided by 8.34 pounds = 5035.97122 gallons of water.
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2,940 US gallons of water weighs about 11.14 metric tons.
how many tons of rock are in a yard?
None. A square kilometre is a measure of area. The tonnage depends on the volume of water, not the area that it is spread over. The height of the water column is also required.
the answer is clearly 86557485 mega tons
10, because 1 tonne = 1000 kg, and 10000 = 1000 x 10