In the last two hundred years, seismic activity in the San Francisco area has produced ____
a. ?major earthquakes at intervals of about 60 years, with few smaller earthquakes
b. ?moderate (magnitude 6+) earthquakes every 10 to 15 years
c. ?moderate earthquakes every 10 to 15 years, and one major earthquake about 100 years ago
d. ?a cluster of moderate and major earthquakes in the early 1900s with a gap until recent moderate earthquakes
e. ?only major earthquakes
ANSWER: d
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