1. Igneous Rocks

2. S6E5. Students will investigate the scientific view of how the earth’s surface is formed
c. Classify rocks by their process of formation.

4. How are igneous rocks formed?
When hot, liquid magma cools and solidifies becoming lava.

5. Composition & Texture of Igneous Rocks
Mafic rocks= light-colored and less dense
Examples: Basalt & Gabbro
Felsic rocks= dark-colored and more dense
Examples: Granite & Rhyolite

6. Composition and Texture of Igneous Rocks
Coarse-grained= Feels rough (large crystals are formed)
Fine-grained= Feels smooth (small crystals are formed)

7. Types of Igneous Rocks
Intrusive igneous rock= Rock formed below the Earth’s surface
Extrusive igneous rock= Rock formed at or near the Earth’s surface

8. Content Objective
Be able to describe the process that forms igneous rocks.
Be able to explain the difference between intrusive and extrusive igneous rocks and the texture of each.