1. Rocks

2. Compare the 2 samples:
Similarities
Differences
Compare the 3 samples

3. Rocks? What are minerals?? Crystal Shape Naturally occurring
Consistent Chemical Composition
Inorganic
Solid

4. Rocks Solid Made from mixtures of: 3 groups
Minerals or
Minerals + parts of things
Dead things
Man-made objects
3 groups
Distinguished by how they are made
Can change between types over time

5. Rock Forming Minerals Of the 4,000 minerals available….only
20 form rocks

7. Identifying Rocks
Color:
Not too helpful
Light-granitic
Dark-basaltic

8. Rock Texture Texture is key Based on Grain appearance
Pieces of minerals that make up the rock

9. Rock Texture
Grain Size
Grain Shape
Grain Pattern

10. Texture Practice

11. Classification Review
Top of Page _______

12. 3 Types of Rock

13. 3 Types of Rock Igneous: Sedimentary: Metamorphic: Melted rock
Broken grains of many rocks joined together
Metamorphic:
Changed from Heat & Pressure

14. Igneous Rocks Intrusive Extrusive Very 1st rock group on Earth
2 Groups:
Based on Cooling Rates
Intrusive
Extrusive
Magma cools slowly
Have large grains
Lava cools quickly
Have small grains

15. Extrusive or Intrusive
Pumice
Basalt
Granite
Obsidian
Tuff

16. Uses of Igneous Rocks
Tools
Building Materials

17. Uses of Igneous Rocks
Scrubbing/cleaning
Gravel

18. So Far…
Rocks
Igneous
Sedimentary
Metamorphic
Extrusive
Intrusive

19. Igneous
Sediments
Sedimentary