The largest earthquakes along western North America are due to subduction beneath the continent. They include ________.
A. the magnitude 8.1 Mexico City event in 1985 which was caused by subduction of the Cocos Plate
B. the plates subducting beneath Oregon and Washington which generated a magnitude 9 earthquake on 26 January 1700
C. the magnitude 9.2 Alaska earthquake in 1964 which was due to subduction of the Pacific Plate
D. All of these choices are correct.
Answer: D
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