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Social Studies, 02.12.2019 19:00

In most earthquakes the earth's crust cracks like porcelain. stress builds up until a fracture forms at a depth of a few kilometers and the crust slips to relieve the stress. some earthquakes, however, take place hundreds of kilometers down in the earth's mantle, where high pressure makes rock so ductile that it flows instead of cracking, even under stress severe enough to deform it like putty. how can there be earthquakes at such depths?

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