What do pumice and obsidian have in common?

Pumice is a form of volcanic rock that’s been created through the process of hydrovolcanic eruptions. It has an extremely porous texture and can be used as an exfoliant to gently remove dead skin cells from your feet, hands, or face. Obsidian on the other hand is a black volcanic glass with many small crystals in it. This type of stone was often used by ancient cultures for tools because its sharp edges made it ideal for cutting down trees and carving things like arrowheads out of wood. It’s also possible to use obsidian today if you need something really durable but not too heavy!