The Rock Pumice Often Floats Yet the Density of the Rock

The rock pumice often floats yet the density of the rock is greater than water. Why does it float?

A) 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.
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 another name for dacite, a low- density rock that floats in water.
D) Pumice is a pyroclastic rock derived from rhyolite glass, and rhyolite glass has a lower density than water.