Here's why:
* Frothy: Pumice is characterized by its lightweight, porous texture, almost like a sponge. This is because of the numerous gas bubbles trapped within the rock as it cools.
* Expanding gas bubbles: The gas bubbles are formed as dissolved gases in the lava (mainly water vapor and carbon dioxide) expand rapidly when the lava erupts and the pressure drops.
* Erupting lava: Pumice forms when the lava erupts explosively, allowing the gas bubbles to expand and become trapped within the solidifying rock.
Pumice is often found in association with other volcanic rocks, like basalt and rhyolite, and can be found in various colors depending on the composition of the lava.
