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Forces in Earth’s Crust
Created by the Marvelous Mr. Christine 8th Grade Science
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What does forces cause?
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Are You Stressed Out Stress: Force that acts on rock to change its shape or volume. 3 Types Tension, Compression, and Shearing Tension: Stretches rock so that it becomes thinner in the middle Compression: Squeezes rock until it breaks or folds. Shearing: Pushes mass of rock in opposite directions, in a sideways movement.
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Tension
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Compression
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Shearing
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You’re at Fault Fault: A break in Earth’s crust where masses of rock slip past each other. 3 Types Normal, Reverse, Strike-Slip
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Normal Fault Type of fault where hanging wall slides downward; caused by tension in crust
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Reverse Fault Type of fault where hanging wall slides upward; caused by compression
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Strike-Slip Fault Fault which rocks on either slide move past each other sideways with little up or down motion.
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Principle of Original Horizontality
Sedimentary Rock are deposited in layers
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Folding Earthquakes change the horizontality by folding.
Folding is where rock is compressed and changes its shape Older Rock can now be found over younger rock
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Anticline Upward fold of rock formed by compression or Earth’s crust.
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Syncline Downward fold in rock formed by compression
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