What is the only rock that will float in water - trivia question /questions answer / answers.
Any with a density less than the fluid into which it is placed. Pumice is a volcanic rock that will sometimes float on water. Improve answer. First answer by Gaines ...
Like all rock types, the concept of volcanic rock is artificial, and in nature volcanic rocks grade into hypabyssal and ... It is so vesicular that it floats in water.