The answer will depend on the depth of the covering that is required. Without that information, the question cannot be answered.
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1 cubic yard of crushed rock fills 3/depth in feet square yards.
It depends on what kind of rock it is.
The answer depends on how deep the coverage will be. River Rock weighs 2,800 LBS. per cubic yard - That's 1.4 tons per cubic yard. One ton = 2,000 LBS. 2,000 divided by 2,800 equals roughly 0.71. So one ton of river rock is roughly 0.71 cubic yards. 0.71 cubic yards covers roughly 230 square feet 1" deep 0.71 cubic yards covers roughly 115 square feet 2" deep 0.71 cubic yards covers roughly 77 square feet 3" deep 0.71 cubic yards covers roughly 57 square feet 4" deep 0.71 cubic yards covers roughly 38 square feet 5" deep
Volume = (1,200 square feet) x (1/3 foot) = 400 cubic feet = 14.81 cubic yards
38ft*6ft*1.5inch = 38/3 yards*2yards*1.5/36yards = 1.055... cubic yards.