Igneous rocks form when molten rock cools and hardens. Readers will learn how differences in composition and cooling form different types of igneous rocks. Chapters include graphic organizers to help explain topics such as mountain formation, volcanoes, and how igneous rocks fit into the larger rock cycle.

Includes index.

All about igneous -- Earth's layers -- Solid to liquid to solid -- Lava and volcanoes -- Extrusive rocks -- Intrusive rocks -- Making mountains -- In between rock -- Minerals in rock -- Part of the cycle! -- Glossary.