Igneous: It Was Liquid Once
- MAGMA comes out of the earth, cools, and sets hard
- NO fossils, ever. Nothing alive survives molten stone
- GRANITE: very hard, smooth, attractive. Laid on floors
- PUMICE: full of holes, and it floats. OBSIDIAN: volcanic glass
Presenter notes: Open with a pencil and, if you can find a picture of one, a diamond. Tell the class that these two substances are made of exactly the same thing, one single element, and nothing else. One is soft enough to leave a mark on paper. The other is the hardest natural substance on Earth and will cut glass. Let them guess what the element is before you say carbon. Then tell them that the only difference is the arrangement of the atoms, and that the arrangement was changed by pressure deep underground, which is exactly what this whole lesson is about: rocks turning into other rocks.