Quote:
Originally Posted by pdurrant
As given, the only possible answer is the one you gave. The rock is described as sinking to the bottom of the tank of water. This would only happen if the rock is denser than the water.
If the rock were made of pumice, and so floated in the water, the water level would stay the same, as whether it was in the boat or in the water it would displace the same volume of water.
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That's precisely the reason. The rock sinking confirmed its density.