1. Rocks and The Rock Cycle

2. Three Types of Rocks
Igneous
Sedimentary
Metamorphic

3. Igneous Rocks
Formed when molted rock (lava or magma) cools and hardens
Two types of Igneous Rocks
Intrusive : cooled slowly beneath the surface, contains large crystals
Extrusive: cooled rapidly on the surface, contains small crystals

4. ?
Intrusive
Extrusive

5. Sedimentary Rocks
1st the rocks are weathered and eroded by wind and water (This means the rock is broken down into little particles called sediment. The sediment is then carried away by wind and water.)

6. Sedimentary Rocks 2nd the sediment is deposited in layers
(This means the sediment is dropped. Over time this forms layers of different sediment.)

7. Sedimentary Rocks
3rd the layers are compacted and cemented together forming sedimentary rock.
(This means the sediment is squeezed and glued together.)

8. Sedimentary Rocks

9. Metamorphic Rocks
Formed when rocks undergo a structural change due to Heat and Pressure

10. The Rock Cycle

11. Quick Check
Metamorphic Rock is rock whose structure has changed. What factors change the rock?
A. heat and pressure
B. compaction and cementation
C. cooling of magma

12. Quick Check
2. An active volcano on a Pacific island spews out lava. When it cools, what has been formed? A. metamorphic rock B. sedimentary rock C. igneous rock

13. Quick Check
3. What type of igneous rock is shown below? A. Intrusive B. Extrusive C. Sedimentary
WHY?????

14. Quick Check
What is the correct order of steps that form sedimentary rock?
A. compaction & cementation, weathering & erosion, deposition
B. weathering & erosion, deposition, compaction & cementation
C. deposition, compaction & cementation, weather & erosion

15. Molten or “melted” rock
Quick Check
5. Where does magma or lava come from?
Molten or “melted” rock