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Our transcription: Earthquakes are shock-waves. They are produced when rocks break and vibrate when two blocks of the Earth's crust slide past one another. This usually occurs along a fault, which is a zone of weakness in the Earth's crust. Movement of the Earth's crust causes stress to accumulate in the rocks of the fault zone. I can feel the stress accumulating in my hands as I try to slide them past one another. The rocks will eventually break when the accumulated stress exceeds the strength of the rocks in the fault.
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