1. Igneous Rocks

2. Formed from the cooling of lava or magma

3. Igneous Rocks are Divided into Two Groups IntrusiveExtrusive

4. Intrusive Igneous Formed from cooling MAGMA Forms deep INSIDE the Earth’s crust Crystals have more time to grow, so they are LARGER Described as COARSE-GRAINED

5. Intrusive Igneous Examples GraniteSyenite

6. Intrusive Igneous Examples DioriteGabbro

7. Extrusive Igneous Formed from cooling LAVA Forms OUTSIDE the Earth Crystals have LESS time to grow, so they are SMALLER OR NON-EXISTANT Described as FINE-GRAINED

8. Extrusive Igneous Examples ObsidianScoria

9. Extrusive Igneous Examples BasaltPumice

10. Quiz Question 1 This is an extrusive igneous rock It has a glassy texture It has been used throughout history to make knives and arrow heads.

11. Quiz Question 1 This is an extrusive igneous rock It has a glassy texture It has been used throughout history to make knives and arrow heads. Answer: Obsidian

12. Quiz Question 2 Can you name this extrusive igneous rock that is often used in foot-care?

13. Quiz Question 2 Can you name this extrusive igneous rock that is often used in foot-care? Answer: Pumice

14. Quiz Question 3 This is an intrusive igneous rock It has coarse-grained texture It is composed of the minerals: quartz, feldspar, and mica

15. Quiz Question 3 This is an intrusive igneous rock It has coarse-grained texture It is composed of the minerals: quartz, feldspar, and mica Answer: Granite