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Stress and Faults

Stress and Faults. 3 Types o f Stress. 1. Tension: stress that pulls rock apart Rock gets thinner in the middle 2. Compression: stress that pushes rock together 3. Shearing: stress that pushes rock in opposite directions. Faults. A fault is a break in the earth’s crust.

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Stress and Faults

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  1. Stress and Faults

  2. 3 Types of Stress • 1. Tension: stress that pulls rock apart • Rock gets thinner in the middle • 2. Compression: stress that pushes rock together • 3. Shearing: stress that pushes rock in opposite directions

  3. Faults • A fault is a break in the earth’s crust. • Fault’s occur along plate boundaries where forces push and pull the earth’s plates.

  4. 3 Types of Faults • 1. Normal Fault: occurs when the rock above the fault (the hanging wall) moves down (along the footwall) • Tension stress causes this type of fault • Creates valleys

  5. 2. Reverse Fault: occurs when rock above the fault (H.W.) move up (along the F.W.) • Compression stress causes this type of fault • Creates mountains

  6. 3. Strike-Slip Fault: occurs when rock on either side of the fault move past each other in opposite directions • There is no up or down motion • Shearing stress causes this type of fault • Example: San Andreas Fault, Cal.

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