Thunder is caused by ________.
A. the compression of free photons in the lightning bolt
B. high temperatures of lightning that flash heat the surrounding air, causing it to expand explosively
C. the compression of free electrons in the lightning bolt
D. the combustion of flammable atmospheric gases by the lightning bolt
E. the compression of free neutrons in the lightning bolt
Answer: B
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Given the calculation: 4.238 x 9.1 = ? What is the answer reported to the correct number of significant figures?
A) 38.5658 B) 38.57 C) 38.6 D) 39
Which of the following represents a typical count of confirmed tornadoes for a year in the United States?
A) 1 B) 10 C) 100 D) 1,000 E) 10,000
Doppler radar is useful in predicting tornadoes because it: a. can identify rotation within a thunderstorm
b. can measure precipitation intensity. c. sends out microwave pulses. d. None of these choices.
The "ozone hole" is a depletion currently most serious
A. In tropical latitudes B. Over North America C. At the most populated latitudes D. Near the equator E. In Antarctica