Quiz 2 2_18_10_Answers-1 - EAS/ENGR 1220 Earthquake! Spring...

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EAS/ENGR 1220 Earthquake! Spring 2010 Quiz 2 2_18_10 ANSWER KEY 1. Which of the following is NOT a component of a lithospheric plate: a) oceans b) asthenosphere c) crust d) uppermost mantle 2. Lithospheric plates typically move at rates of: a) a few cm per year b) a few kilometers per day c) a few miles per hour d) a few millimeters per million years 3. The Wadati –Benioff zone is a: a) region beneath midocean ridges that melts to form oceanic crust b) the boundary between the mantle and outer core c) the portion of the San Andreas fault that “creeps” (slips slowly) rather than abruptly as in an earthquake d) a dipping zone of earthquakes that typically extends to upper mantle depths 4. Continental crust is formed: a) by partial melting of subducting plates and overlying mantle b) erosion of oceanic crust and its redeposition c) fractional melting of magmas rising as part of “hot spots” d) melting of oceanic crust at mid-ocean ridges 5. The Curie point refers to a) The time at which the earth’s magnetic field switches polarity b) The temperature at which many materials “freeze in” their magnetic
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Quiz 2 2_18_10_Answers-1 - EAS/ENGR 1220 Earthquake! Spring...

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