1. I. Formation They are formed when hot, liquid rock, or magma, cools and solidifies (Hardens)

2. II. Classification Igneous rocks are classified according to their composition and texture.

3. 4 basic types of textures Fine-Grained Coarse-Grained Glassy Porphyritic

5. III. Magma vs. Lava Magma – molten material below the earth’s surface. Lava – molten material above the earth’s surface.

7. A. Intrusive Igneous Rocks: Magma pushes into surrounding rock below the Earth’s surface Cools slower Large Crystals Think: (INSIDE)

8. Examples:

9. Did you know?!?! Granite is the most abundant intrusive rock!

10. B. Extrusive Rocks: forms when magma erupts onto the Earth’s surface (lava), cools quickly very small or no crystals formed  Think: (EXTERIOR)

11. Example: Basalt is the most common EXTRUSIVE igneous rock!

12. Did you know?!?! Another name for an Extrusive rock is a VOLCANIC rock

14. A Closer Look at an Igneous Rock Obsidian is a dark-colored volcanic glass that forms from the very rapid cooling of molten rock material. It cools so rapidly that crystals do not form. Is it fine-grained or coarse-grained? Is this rock Intrusive or Extrusive? Is it fine-grained or coarse-grained? Is this rock Intrusive or Extrusive?

15. http://www.youtube.com/watch?v=P qgHUPSTojY http://www.youtube.com/watch?v=P qgHUPSTojY Must write down TWO things you learned!!!! Be prepared to share!

16. http://www.youtube.com/watch?v=rkGVE6 wNAzo A little Science Rap