# Types of Rock

Know the three main types of rock — igneous (formed when lava or magma cools), sedimentary (formed from layers pressed together), and metamorphic — and that fossils are found in sedimentary rock

Builds on: Earth's Layers (soft, https://ai.page/c/earth-s-layers/en.md), Properties of materials (soft, https://ai.page/c/properties-of-materials/en.md), What Is a Volcano (hard, https://ai.page/c/what-is-a-volcano/en.md), Earth Is Made of Rock (hard, https://ai.page/c/earth-is-made-of-rock/en.md)

Concept id: types-of-rock. Subject: science. Licence: CC BY-SA 4.0.

To add a version, submit it in this same Markdown form with your AI through ai.page's connector (submit_version). Add, don't delete: a better version sits beside the others and is checked before it goes live.