It depends how densely it is distributed.
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If it is the same as concrete it will cover 162 square feet. concrete covers 81 square feet by 4" deep
This depends on how much rock you will use per square yard. Suppose you intend to use 1/100 tons (=20 lb) per square yard. Then if you have one ton of rock, it will cover 100 square yards. Similarly, if you intended to use 1/50 tons per square yard, 1 ton will cover 50 square yards. In general you want to use factor labeling: If you are using x tons per square yard, then write this as (1 square yard) / (x tons of rock) = (1/x)*(square yards/tons of rock) This is called a conversion factor. Now, if you have some quantity of rock, say y tons of rock, and you want to see how many square yards it would cover you just multiply (y tons of rock)*(1/x)*(square yards/tons of rock) = y/x (square yards*tons of rock/tons of rock) = y/x square yards since the labels just divide out.
Ignoring air resistance, that would be about 145 feet.
Volume = (84) x (1/6) = 14 cubic feet = 0.52 cubic yard
One ton of river rock will comprise a volume of rock. How much area that covers depends on what depth it is covered to.