The rock pumice often floats yet the density of the rock is greater than water.Why does it float?
A)Pumice is a pyroclastic rock derived from rhyolite glass,and rhyolite glass has a lower density than water.
B)Pumice is a pyroclastic rock comprised largely of open voids formed by gases released when the magma solidified as froth-like material.
C)Pumice is a rock made of rhyolite glass that erupts into water,which traps water in voids and makes the material less dense than water.
D)Pumice is another name for dacite,a low-density rock that floats in water.

Question

Quizplus · Accepted Answer

Pumice is a pyroclastic rock that contains a large number of open voids formed by gases released when the magma solidified as froth-like material. These voids make the density of pumice lower than water, causing it to float despite having a greater density than water.

The Rock Pumice Often Floats Yet the Density of the Rock