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?

The Mantle – Earth’s Fascinating Layers, Part 2

The mantle is approximately 1,800 miles thick! The solid mantle material is made of materials rich in iron, aluminum, magnesium, oxygen and silicon. The temperature in the mantle is over 1,000 degrees Celsius.