It depends on the thickness and the density. One ton should be about 15 cubic feet when compacted, so it would cover 30 square feet 6 inches thick or 45.
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One ton of river rock will comprise a volume of rock. How much area that covers depends on what depth it is covered to.
Depends on if by 'customary' you're referring to a short ton or a long ton. A short ton is less than a metric ton; a long ton is more than a metric ton.
1 ton.
== == A square foot is a (two dimensional) measure of area, while a ton is a measure of weight. The two do not equate. On the other hand, a ton of a specific substance could have a specific (three dimensional) volume. For instance, if a one cubic foot concrete block weighed 100 pounds, 20 concrete blocks would equal a (US) ton.
To lift 1 ton (equal to 2,000 pounds) with a hydraulic system, you would need to apply 2,000 pounds of force. Since pressure is force divided by area, and the area of a typical hydraulic cylinder is around 1 square inch, you would need 2,000 pounds per square inch (psi) of pressure to lift 1 ton. In other words, you would need a hydraulic system capable of generating 2,000 psi to lift 1 ton.