On average, what percentage of solar energy striking the outer atmosphere eventually reaches Earth's surface?
a. ?5 percent
b. ?15 percent
c. ?30 percent
d. ?50 percent
e. 70 percent?
ANSWER: d
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It appears that, as the number of sunspots increases, the sun's total energy output:a
increases slightly b. decreases slightly c. begins to alternately increase and decrease above average values d. does not change
Anticyclones
A) have strong winds. B) are identified by their tightly spaced isobars. C) do not appear in the continental United States. D) have skies that are mostly clear. E) cause violent weather events.
What were Soviet citizens complaints with the command economy system prior to the Second Russian Revolution?
Which of the following is a recognizable characteristic of recent calderas?
A. long, narrow valley B. large, conical mountain form C. steep-sided basin-shaped depression