1. Elevated Landforms Castle Rock, CO Shiprock NM Mt. Cotopaxi Ecuador
Pikes Peak CO

2. If you can’t take the heat, stay out of the kitchen. H. S Truman
Igneous Rocks
If you can’t take the heat, stay out of the kitchen.
H. S Truman

3. Mantle and outer core are melted
Igneous Rocks
Formed from cooled magma (melted rock)
Inner core
Outer core
Mantle and outer core are melted
Mantle
Crust

4. Igneous Rocks
Parts of the crust can be melted

5. The most common type of igneous rock—basalt!
Igneous Rocks
(Notice the ocean floor?)
The most common type of igneous rock—basalt!

6. Igneous Rocks
Magma on the surface is called lava

7. Igneous Rocks
We will study the motion of these lithospheric plates in the next unit

8. Igneous Rocks
(Notice the difference in the crust?)

9. Igneous Rocks The slower it cools, the larger the crystals grow
Intrusive— cools inside the crust
Extrusive— cools outside the crust

10. Igneous Rocks The slower it cools, the larger the crystals grow
Intrusive— cools inside the crust
--cools slowly
Extrusive— cools outside the crust
--cools fast

11. Igneous Rocks The slower it cools, the larger the crystals grow
Intrusive— cools inside the crust
--cools slowly —large crystals
Extrusive— cools outside the crust
--cools fast —small crystals

12. Igneous Rocks The slower it cools, the larger the crystals grow
Intrusive— cools inside the crust
--cools slowly —large crystals--rough
Extrusive— cools outside the crust
--cools fast —small crystals--smoother

13. Igneous Rocks
Q: What about a rock that cools slowly for a while, then gets exposed so it cools quickly at the end?

14. Igneous Rocks
Q: What about a rock that cools slowly for a while, then gets exposed so it cools quickly at the end?
A: You get large
crystals in a fine
gray background

15. Igneous Rocks
Vary in color due to the differences in the mineral content of the magma
Light Minerals Dark Minerals
Quartz Amphibole
Potassium Feldspar Biotite mica
Muscovite mica Pyroxene
Olivine

16. Igneous Rocks Magma varies depending on where it’s found
Ocean Floor Continental
darker color lighter color
denser lighter (less dense)
thinner fluid thicker fluid
less gas bubbles more gas bubbles

17. More gas bubbles makes a more violent volcanic eruption!
Igneous Rocks
Magma varies depending on where it’s found
Ocean Floor Continental
darker color lighter color
denser lighter (less dense)
thinner fluid thicker fluid
less gas bubbles more gas bubbles
More gas bubbles makes a more violent volcanic eruption!

18. Igneous Rocks
Classified by color and texture
See Table on pU20

19. Igneous Rocks
Classified by color and texture
See Table on pU20

20. Continental Igneous Rocks
Types: (By color and texture)
Light and Coarse—pegmatite (and granite)
Light and Medium—Granite
Light and Fine—rhyolite

21. Intermediate Igneous Rocks
Types: (By color and texture)
Medium and Coarse—pegmatite (and diorite)
Medium and Medium—Diorite
Medium and Fine—Andesite (and basalt)

22. Oceanic Igneous Rocks Types: (By color and texture)
Dark and Coarse—pegmatite (and gabbro)
Dark and Medium—Gabbro
Dark and Fine—Basalt

23. Igneous Rocks Types: Special: Glassy—obsidian Light and Frothy—Pumice
Dark and Frothy—Scoria
Very Dark—peridotite

24. Igneous Rocks
Continental—tossed into the air to cool by expanding gasses
Types:
Special: Glassy—obsidian
Light and Frothy—Pumice
Dark and Frothy—Scoria
Very Dark—peridotite
Continental—gas is trapped in the rock
Oceanic