The ________ segment of the San Andreas fault is the only one not to have a long rupture in historic time. In prehistory, it has ruptured every 250 years on average, but the last big movement was in 1690.
A. southern
B. middle
C. "creeping"
D. northern
Answer: A
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Which of the following is an example of a secondary volcanic hazard?
a. lava flows b. pyroclastic flows c. ash falls d. volcanic gases e. lahars
Geographers Frank and Deborah Popper have proposed that in the future, much of the Great Plains should be taken out of agricultural production and instead used for what?
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Answer the following statement true (T) or false (F)