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Download 5.1 notes What processes change Earth`s crust? Objective: Compare
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5.1 notes What processes change Earth’s crust? Objective: Compare and contrast the processes of folding and faulting in Earth’s crust Some changes in Earth’s surface occur very suddenly. Some take hundreds, thousands even millions of years to happen. Over time, pressure in Earth’s crust can cause layers to bend, curve, or wrinkle. This is called Folding. Rocks may crack underneath, but the layers stay together. Upward folds are called anticlines, and downward folds are called synclines. FAULTING: Pressure deep in the Earth can also cause rocks to break. A break in a rock is called a fracture. When movement of rock takes place along a fracture, it is called a fault. Faulting causes rocks to move up and down or side to side a tiny distance. Pressure builds up and when it is released, movement occurs. Four common faults are: Normal faults: Reverse faults: crust below faults along which the movement is vertical (up and down) faults where the crust above the fault plane rises in relation to the Strike-slip fault: fault along which the movement is horizontal (side to side). An example of a huge strike-slip fault in California is the San Andreas Fault. Movement along this fault causes many earthquakes in the area Thrust fault: fault that is a low-angle reverse fault