There is no such unit as "square acre". The problem will be worked using simply "acres".
(70 acres) x (43,560 sq-ft per acre) x (10 ft) / (27 cubic ft per cubic yd) = (1,129,333 and 1/3) cubic yds
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To convert acres to cubic yards, you first need to convert 70 acres to square feet, which equals 3,049,200 sq ft. Then, multiply this by the depth of 10 ft to get a volume of 30,492,000 cubic feet. Finally, divide this by 27 (since there are 27 cubic feet in a cubic yard) to get approximately 1,128,000 cubic yards.
There are 13,500 cubic yards in 10 acres that are 5 feet deep. This calculation is based on the formula for volume: length x width x depth. Since 1 acre is equivalent to 4840 square yards, and the volume of 5 feet of soil per acre is 1800 cubic yards, the total is 13,500 cubic yards for 10 acres.
There are 810 cubic yards in 6 acres of land that is 3 feet deep. This calculation is based on the conversion factor that 1 acre equals 4840 square yards and that 1 cubic yard equals 27 cubic feet.
You would need approximately 2.5 cubic yards of gravel to cover a 12' by 15' area at a depth of 2 inches.
To convert square yards to cubic yards, you need to multiply by the depth. In this case, 440 square yards at a depth of 1 foot would be equivalent to 440 cubic yards.
To convert 400 square feet at 5 inches deep to cubic yards, first convert depth to yards (5 inches = 5/36 yards). Then, multiply 400 sq ft by the depth in yards to get the volume in cubic feet (400 * 5/36 = 55.56 cubic feet). Finally, convert cubic feet to cubic yards (1 cubic yard = 27 cubic feet), giving you approximately 2.06 cubic yards.