If the San Andreas fault moves 2 meters (6.6 feet) per big earthquake, and plate movement is 2.5 centimeters (0.025 meter per year, or 1 inch per year), how many years of plate motion must accumulate to produce one big earthquake? (Assume all plate motion is accommodated by movements on the San Andreas fault.)
a) 4 years
b) 20 years
c) 80 years
d) 200 years
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