The eruption of Mount St. Helens
A) caused a major decrease in the global temperature in 1980.
B) caused a major increase in the global temperature in 1980.
C) was triggered by El Niño.
D) saw most of the ejected gases and dust reach the stratosphere.
E) none of the above
E
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Which of the following factors is most important in determining the strength of a tornado?
a. diameter. b. air temperature. c. duration. d. central pressure.
Over the past 100 years or so, it appears that average global temperatures have:a
increased slightly b. fluctuated widely but shown no overall change c. decreased slightly d. remained constant
List four greenhouse gases
What will be an ideal response?
In which of these four lakes is the water table above the land surface?
A. 2 and 3 B. 1 and 2 C. 1 and 4 D. 3 and 4 E. None of these choices are correct.