Ask-a-Geologist Video #11: Why do pumice and scoria have holes and granite does not?

Hi everyone, today we have another great ask-a-geologist question from one of our fabulous readers. Peter wrote to us and asked: Granite, pumice, and scoria are igneous rocks, but why doesn’t granite have airholes, but the other two do?

What are some household items made out of igneous rock?

Igneous rocks are often used as building materials and in the production of household items.