Athletic field in Taiwan
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Transcript of Athletic field in Taiwan
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Athletic field in Taiwan
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Forces in Earth’s Crust
Stress: a force that acts on rock to change its shape or volume. (This may take millions of years)
3 Types of Stress:1. Tension: pulls on the crust stretching rock so that it becomes thinner in the middle
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2. Compression: squeezes rock until it folds or breaks
3. Shearing: pushes a mass of rock in 2 opposite
directions
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Faults: occur along plate boundaries, where the forces of plate motion push or pull the crust so much that the crust breaks
3 types of faults1. Normal fault: tension in Earth’s crust pull rocks apart;
hanging wall slides downward
footwall hanging wall
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2. Reverse fault caused by compression in the crust, the hanging wall slides upward
3. Strike-slip fault rocks on either side move past each other sideways with little up –or –down motion
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Normal Fault
Reverse Fault
Strike-Slip fault
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Changing Earth’s surface:over millions of years, the forces of plate
movement can change a flat plain into land forms such as*anticline- upward fold in rock formed by compression*syncline- downward fold in rock formed by compression*plateau- large area of flat land elevated high above sea level
Anticline Syncline
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*Folded mountains- where 2 plates collide Alps in Europe and Himalayas in Asia
*Fault-Block mountains – where 2 faults parallel to each other pull apart, each side slides down
Part of the Rockies