Pumice is a very light, porous volcanic rock that forms during explosive eruptions. During the eruption, volcanic gases dissolved in the liquid portion of verz viscous magma expand very rapidly to create a foam or froth; the liquid part of the froth then quickly solidifies to glass around the gas bubbles.

What does pumice turn into?

As pumice rock compacts on its air pockets, it becomes denser and heavier, becoming a different type of rock altogether, combining with other rocks to become metamorphic rock. These rocks include schist, slate and gneiss.

What is the process of pumice?

Pumice is a type of extrusive volcanic rock, produced when lava with a very high content of water and gases is discharged from a volcano. As the gas bubbles escape, the lava becomes frothy. When this lava cools and hardens, the result is a very light rock material filled with tiny bubbles of gas.