When she dropped a rock into a graduated cylinder of water, veronica noticed it sank to the bottom. she decided to investigate what it would do if she tossed it into a much larger amount of water. when she tossed it into a lake, the rock sank again. a) the density of a substance is the same regardless of the amount. b) the lake had become less dense because of heavy rains in the past month. c) the rock was already wet from being submerged in the graduated cylinder of water. d) an object's density changes based on the amount of substance in which it is submerged.