Practice Quiz 3 - 1. Earthquakes can be caused in many...

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1. Earthquakes can be caused in many different ways. The best available evidence indicates that for most of the planet’s earthquakes: A. Are caused by Pepsi machines exploding after being kicked by Coke drinkers. B. The rare, deepest ones are caused by “implosion” as minerals in downgoing slabs of subduction zones suddenly switch to a denser arrangement, whereas common shallower ones are caused by elastic rebound of bent rocks when a fault breaks. C. Human-made atomic-bomb testing is responsible. D. The deepest ones are caused by elastic rebound of bent rocks when a fault breaks, whereas shallower ones are almost all caused by cave-ins of natural caverns. E. Are caused by Coke drinkers kicking the Pepsi machines in Penn State buildings. “Implosion” is the currently favored idea. As subduction zones take rocks deeper where pressure is higher, the building blocks tend to reorganize to take up less space, shifting from, say, a one- on-top-of-another pattern to a fit-in-the-space-between-those-below pattern. Sometimes, this seems to be delayed and then to happen all at once (I can’t move until my neighbor does…), giving an implosion. The biggest, deepest earthquakes happen where temperatures and pressures are so high that we don’t think rocks can break. Humans have never made a hole anywhere nearly as deep as the deeper earthquakes. We have mostly quit testing atomic bombs. And, a big earthquake is way bigger than a big atomic bomb. Penn State students, being naturally even-
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This note was uploaded on 09/01/2010 for the course GEOSC 010 taught by Professor Alley,richardbanandakrishnan,sr during the Spring '08 term at Pennsylvania State University, University Park.

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Practice Quiz 3 - 1. Earthquakes can be caused in many...

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