Why does occlusion occur in a middle-latitude cyclone?
A. Warm fronts travel more quickly than cold fronts.
B. Warm fronts and cold fronts travel at the same speed.
C. Cold fronts travel more quickly than warm fronts.
D. Cold air rises up and over warm air.
Answer: C
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Which of the following accurately describe Popocatépetl's activity over the past few thousand years?
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In January 2010 and March 2011, two major earthquakes occurred in ____ and ____
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