1. Rocks, Rocks and More Rocks!
Igneous
Sedimentary
Metamorphic

2. Igneous Rocks Notes: Extrusive Igneous Rocks
Rock formed from lava that erupted onto Earth’s surface.
Basalt – most common extrusive rock on Earth. It forms most of Earth’s ocean floor.

3. Igneous Rocks
Earth's Most Abundant Bedrock
Basalt underlies more of Earth's surface than any other rock type. Most areas within Earth's ocean basins are underlain by basalt.
Although basalt
is much less common
on continents,
lava flows and flood
basalts underlie several
percent of Earth's land
surface. Basalt is a very
important rock.

4. Igneous Rocks Notes: Intrusive Igneous Rocks
Rock formed from magma that has hardened beneath Earth’s surface.
Granite – the most abundant intrusive rock on Earth’s continents.
Forms the core of many mountain ranges.

5. How igneous rocks form
Extrusive
Intrusive

6. Stone Mountain, Georgia
Granite is also well-known by its many world-famous natural exposures. These include:
Stone Mountain, Georgia

7. Mount Rushmore, South Dakota

8. Pike’s Peak, Colorado

9. Yosemite Valley, California

10. Igneous Rocks Facts about granite:
Granite is the best-known igneous rock. Many people recognize granite because it is the most common igneous rock found at Earth's surface and because granite is used to make many objects that we encounter in daily life. These include counter tops, floor tiles, paving stone, curbing, stair treads, building veneer and cemetery monuments. Granite is used all around us - especially if you live in a city.
Facts about granite:

11. Igneous Rocks
Granite

12. Igneous Rocks Notes for Texture: Fine grained
Lava cooling quickly forms a fine-grained rock with small crystals.
Example: Basalt - glassy texture, crystals too small to be seen without a microscope.
Example: Obsidian –smooth, shiny texture like thick glass & cooled without forming crystals.

13. Igneous Rocks
Obsidian
Obsidian on the side of a volcano

14. Igneous Rocks Notes for Texture: Coarse-grained
Slowly cooling magma forms coarse-grained with large crystals
Example: Granite

15. Mineral Composition Notes:
When rocks are high in silica they form light-colored rocks like Granite.

16. When rocks are low in silica they form dark-colored rocks like basalt.

17. Uses of Igneous Rock Notes: All made from Granite Statues Bridges
Buildings
Paving streets
Curbstones
Floors
Countertops

18. Uses of Igneous Rock Gravel for construction – Basalt
Cleaning and polishing – Pumice
Sharp tools for cutting – Obsidian
Fertilizer – Perlite, which is formed from heating Obsidian

19. Uses of Igneous Rock
Statues, Public Buildings - Granite

20. Uses of Igneous Rocks
Cobblestone streets, kitchen countertops