1. Earth’s Crust in Motion

2. Stress in the Crust Earthquake is the shaking and trembling that results from the movement of rock beneath Earth’s surface.

3. Types of Stress 1.Shearing 2.Tension 3.Compression

4. Types of Stress

5. Faults 1.Strike-Slip Fault 2.Normal Fault 3.Reverse Fault

6. Strike-Slip Fault Stress that causes Strike-Slip Faults: Shearing

7. Strike-Slip Fault Example The San Andreas Fault in California.

8. Normal Fault Stress that causes Normal Fault is: Tension

9. Normal Fault Example The Sandia Mountains in New Mexico were created by a Normal Fault.

10. Reverse Fault Stress that causes a reverse fault: Compression

11. Reverse Fault Example Mt Gould in Glacier National Park

12. Friction Along Faults Little Friction- quicker movement, less force to overcome friction. More Friction- stress must build up to move one plate past another. When stress is released more powerful earthquake can result.

13. Mountain Building Mountains Formed by Faulting. Fault Block Mountains- Teton Range Wyoming (2 normal faults)

14. Mountains by Folding Folds are bends in rock that form when compression shortens and thickens part of Earth’s crust

15. Folded Mountains Example: Himalayas and Alps

16. Anticlines and Synclines

17. Examples of Anticlines and Synclines Anticline-Black Hills South Dakota Syncline-Illinois Basin

18. South Dakota

19. Plateau Example- Colorado Plateau including Four Corners (Arizona, Utah Colorado, New Mexico)