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The volume of the rock is the amount of water it displaces, 250ml. Considering that 1ml of water has a mass of 1 mg, the mass of the rock is 5.63 x 250gm = 1,407.5mg.
That's impossible to answer, since it entirely depends upon the type of rock. Some types of rock are much denser than others- for example, a piece of igneous rock such as granite, is much heavier than a same sized piece of sedimentary rock such as sandstone. It varies considerably.
Pebble or stone. Those words mean small rock.
One ton of river rock will comprise a volume of rock. How much area that covers depends on what depth it is covered to.
Some rocks cost 100 times more than others - and that's just plain rocks, not gems. So pick a rock, any rock.