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Our transcription: The same tectonic forces that fold rocks can also caused rocks to break. Rocks tend to fracture instead of fold when the force is applied rapidly. This is especially true in the shallow portions of the Earth's crust where rocks are relatively cold and under low pressure. Where tectonic stress is applied constantly over a long period of time, the fractures are concentrated along a discrete zone called a "fault." Some faults remain active for millions of years resulting in hundreds or even thousands of kilometers of displacement. Fault movement generally occurs in a series of steps or jumps generating a series of earthquakes.
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