1. Identifying Rocks

2. All rocks are classified by how they form.
Rocks can form a couple of different ways:
Intense heat and pressure
Melting and Cooling of Magma/Lava
Erosion , compaction and cementation of sediment over millions of years
Based on how rocks form, there are 3 types:
Igneous
Metamorphic
Sedimentary

3. Igneous
Are formed when lava cools on the Earth’s surface OR when magma cools down below the Earth’s surface
Hints that you are seeing an igneous rock:
Bubbles
Glassy appearance
Big grains of minerals

4. Bubbles

5. Glassy Appearance

6. Big Grains

7. Metamorphic
Metamorphic rocks are made when old rocks change due to heat or pressure inside of the Earth
Hints that you are seeing a metamorphic rock:
Bending (ribbon) layers
Squished Grains

8. Bending Layers

9. Squished Grains

10. Sedimentary
Sedimentary rocks are made of sediments (particles) that build up in layers, usually at the bottom of a river or lake.
Hints that you are seeing a sedimentary rock:
Flat (foliated) layers
Mix of particle size

11. Flat Layers

12. Mix of Particle Size

13. Test Yourself by trying to identify the correct type of rock for each of the following pictures

14. Sample 1
The example is a _____ rock. I know this because _____.

15. Sample 2
The example is a _____ rock. I know this because _____.

16. Sample 3
The example is a _____ rock. I know this because _____.

17. Sample 4
The example is a _____ rock. I know this because _____.

18. Sample 5
The example is a _____ rock. I know this because _____.

19. Sample 6
The example is a _____ rock. I know this because _____.

20. Answers Sedimentary (mix of particle size) Igneous (bubbles)
Metamorphic (bending ribbon layers)
Igneous (glassy appearance)
Sedimentary (flat foliated layers)
How did you do???