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# Three Types of Faults (Grade 7)

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## Three Types of Faults

 Strike-Slip Fault Normal Fault Reverse Fault A strike-slip fault occurs when rocks move horizontally, or slide past each other. These faults form under shearing, or sliding, forces. Strike-slip faults are identified as right-lateral or left-lateral depending on the direction of movement of the rock blocks. The diagram shows a left-lateral fault. If you placed one foot on each side of the fault line while the rock block moved, your left foot would move toward you. The famous San-Andreas fault is a right lateral strike-slip fault. It is also a transform fault, or a strike-slip fault that forms along plate boundaries. A normal fault forms when tensional stress pulls rocks apart. When this happens, the rock block on the upper side of the fault will drop down compared to the rock block on the lower side of the fault plane. The rock block that drops is called the hanging wall. The rock block on the other side of the fault plane is the footwall. The diagram shows the footwall on the left of the fault plane and the hanging wall on the right. A reverse fault forms under compressional forces. Think of it as the opposite, or reverse, of a normal fault. The rocks are squeezed inward. The hanging wall moves upward along the fault plane. The diagram shows the hanging wall on the right of the fault plane and the footwall on the left. A thrust fault is a normal fault with a low angle fault plane.

1.
What is a fault?
1. the point inside Earth at which an earthquake occurs
2. the point on Earth's surface directly above the earthquake focus
3. a fracture in Earth along which movement has occurred
4. a fracture in Earth along which NO movement has occurred
2.
What type of fault does the diagram represent?
1. ring
2. normal
3. reverse
4. strike-slip
3.
A                   is created when rocks move past each other side by side.
1. strike-slip fault
2. normal fault
3. reverse fault
4.
What type of fault usually occurs because of compression?
1. folded
2. normal
3. strike-slip
4. reverse
5.
In which type of fault does the hanging wall slide down due to tension in the crust?
1. normal
2. reverse
3. strike-slip
6.
Which side of the fault is the footwall?
1. Left
2. Right
7.
What type of plate boundary will most likely be associated with the fault shown?
1. divergent
2. transform
3. convergent
8.
A large, well-known strike-slip fault in western California is the New Madrid fault.
1. True
2. False
9.
Which scientific theory is best represented by the diagram?
1. Big Bang
2. Evolution
3. Plate Tectonics
4. Continental Drift
10.
What are the differences between a normal fault and a reverse fault?

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