Do Now for Wednesday, February 20 th ! Use your knowledge of the Law of Superposition to arrange the...
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![Page 1: Do Now for Wednesday, February 20 th ! Use your knowledge of the Law of Superposition to arrange the layers of Earth from oldest to youngest.](https://reader035.fdocuments.in/reader035/viewer/2022070410/56649ea95503460f94bacc30/html5/thumbnails/1.jpg)
Do Now for Wednesday, February 20th!Use your knowledge of the Law of Superposition to arrange the layers of Earth from oldest to youngest.
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Stress and Faults**
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An earthquake is the shaking and trembling that results from the movement of rock beneath the Earth’s surface.These forces are defined as stress!
Stress in the Crust
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3 Types of Stress*
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1. Compression: stress that pushes rock together
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2. Tension: stress that pulls rock apartRock gets thinner in the middle
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3. Shearing: stress that pushes rock in opposite directions
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Any change in the shape of the Earth’s crust is called a deformation.
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FaultsA fault is a break in the earth’s crust.
Fault’s occur along plate boundaries where forces push and pull the earth’s plates.
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1. Strike-Slip Fault: occurs when rock on either side of the fault moves past each other in opposite directionsThere is no up or down motionShearing stress causes this type of faultExample: San Andreas Fault, Cal.
3 Types of Faults
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*2. Normal Fault: occurs when the rock above the fault (the hanging wall) moves down (along the footwall)Tension stress causes this type of faultCreates valleys
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3. Reverse Fault: occurs when rock above the fault (H.W.) move up (along the F.W.)Compression stress causes this type of faultCreates mountains
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* Strike Slip Fault!
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Mountain Building Two normal faults can form a fault block mountain.
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Grand Tetons - Wyoming
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Mountains formed by folding
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Folds are bends in rock that form when compression shortens and thickens part of the Earth’s crust. Folds can be a few centimeters across or hundreds of kilometers wide.
Himalayan Mountains are folded mountains!
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*An upward fold in rock is called an ANTICLINE!*A downward bend in the middle of rock is called a
SYNCLINE!
Black Hills, SD
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Plateau – A large area of flat, elevated land, high above sea level.
North Rim, Grand Canyon, AZ