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.
4 basic types of textures
Glassy – black and sharp
Fine grained – interlocking pieces
Coarse grained – consist of interlocking mineral crystals
Porphyritic – made of large crystals scattered on the back of small crystals.

3. Igneous Rocks Coarse-Grained Fine-Grained Granite Rhyolite Gabbro
Basalt

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

6. IV.
2 Types of
Igneous Rocks

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

8. Examples:
GRANITE
GABBRO

9. Granite is the most abundant intrusive rock!
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. Basalt is the most common EXTRUSIVE igneous rock!
Example:
BASALT
Basalt is the most common EXTRUSIVE igneous rock!

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

13. Magma Rocks

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?

15. Must write down TWO things you learned!!!!
Igneous Rock Video
Must write down TWO things you learned!!!!
Be prepared to share!

16. A little Science Rap
wNAzo