The accompanying graph shows the number of violent tornados in the last 60 years. Based on when most global warming has occurred, one would conclude
A. global warming has had a major impact on the number of tornados.
B. global warming has not had an impact on the number of tornados.
C. global warming has had a major impact on the number of tornados in the early part of the century.
D. global warming has had a major impact on the number of tornados since 2000.
Answer: B
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Rural Chinese periodic markets are configured to
A) optimize profits by being open every day of the year. B) follow lunar cycles. C) follow religious days of rest. D) change locations every 5 days. E) only be conducted near large population centers.
Which of the following rock photographs depicts a felsic igneous rock?
A. 
B. 
C. 
D. 
About how much water in the oceans is moving in currents at any given time?
A. 30 percent B. 40 percent C. 10 percent D. 20 percent
Which type of mineral resource is associated with layered intrusions?
A. Diamonds B. Petroleum C. Metallic minerals D. Natural gas