Igneous Rocks

Lava Flow Igneous rocks are the most common types of rocks found on Earth. These rocks are responsible for the majority of Earth's solid surface. Igneous rocks are mined and used in construction and as a building material. Many of these igneous rocks formed with the Earth billions of years ago from magma or lava as Earth cooled. In this topic, you will explore the properties of igneous rocks and learn how they form.

Essential Questions

  • How do igneous rocks form?
  • Where do igneous rocks form?
  • What are the physical and compositional characteristics used to identify and classify igneous rocks?