1. With Mrs. Coates (and her 6-yr-old Son)
Igneous Rocks
With Mrs. Coates (and her 6-yr-old Son)

2. Rocks
3 Types of Rocks:
Igneous
Sedimentary
Metamorphic

3. Igneous rocks are formed from magma or lava.
Igneous means “made from fire or heat.”
When the rock is liquid & inside the earth, it is called magma. Outside the earth it is called lava.
Igneous rocks are formed from magma or lava.

4. Igneous When magma cools under the Earth’s surface it becomes rock!
We call rocks that cool INSIDE the Earth INTRUSIVE IGNEOUS ROCK.

5. Igneous
We call rocks that cool OUTSIDE the Earth EXTRUSIVE IGNEOUS ROCK.

6. Igneous Intrusive vs. Extrusive Igneous Rock Intrusive Rocks
Extrusive Rocks
Cool Slowly
Cool Quickly
Forms Big Mineral Crystals
Forms VERY tiny Mineral Crystals

7. Igneous BIG PINK AND BLACK CRYSTALS NO CRYSTALS, FULL OF HOLES!
Intrusive Rock
Extrusive Rock
BIG PINK AND BLACK CRYSTALS
NO CRYSTALS, FULL OF HOLES!

8. Igneous Intrusive Rock Extrusive Rock Large Black Crystals
TINY White Crystals

9. Intrusive or Extrusive?
Igneous
Intrusive or Extrusive?

10. Igneous
Extrusive
There are no visible crystals and the rock is full of holes. This rock must have cooled quickly.

11. Intrusive or Extrusive?
Igneous
Intrusive or Extrusive?

12. There are very large crystals, which indicate slow cooling
Igneous
Intrusive
There are very large crystals, which indicate slow cooling

13. Intrusive or Extrusive?
Igneous
Intrusive or Extrusive?

14. Igneous
Intrusive
There are several large crystals. Large crystals are formed when magma cools slowly.

15. Intrusive or Extrusive?
Igneous
Intrusive or Extrusive?

16. Igneous
Extrusive
There are no visible crystals and the rock is full of holes. This rock must have cooled quickly.

17. Intrusive or Extrusive?
Igneous
Intrusive or Extrusive?

18. There are no visible crystals. This rock must have cooled quickly.
Igneous
Extrusive
There are no visible crystals. This rock must have cooled quickly.

19. Intrusive or Extrusive?
Igneous
Intrusive or Extrusive?

20. There are very large crystals. This rock must have cooled slowly.
Igneous
Intrusive
There are very large crystals. This rock must have cooled slowly.

21. How are igneous rocks grouped?
Sample test question:
How are igneous rocks grouped?
A. by the shape and size of the rock sample
B. by how quickly the molten magma cooled
C. by the place in the world the sample was found.
D. by whether there are layers or bands of crystals