1. Section 9-1
What happens once the elastic limit of a rock is passed? Where does this occur?
Define earthquake.
Describe the 3 types of forces. (p. 237)
Describe the 3 types of faults.

2. Once the elastic limit of a rock is passed, the rock will bend and may break.
The surface along which rocks break and move is called a fault.
An earthquake is the movement of the ground caused by waves from energy released as rocks move along faults.

3. Faults can be caused by 3 different forces:
Compression forces squeeze or press together.
Tension forces cause stretching or elongation.
Shear forces cause slippage and rocks to move past each other.

4. Types of Faults
Normal Fault – a pull-apart (tension) fracture where rocks that are above the fault surface drop down ward in relation to rocks that are below the fault surface

6. Reverse Fault – a compression (push) fracture in rocks where rocks that are above the fault surface are forced up over rocks that are below the fault surface

8. Strike-Slip Fault – a break in rocks due to shearing forces where rocks on either side of the fault move past each other without much upward or downward movement