At high latitudes during the summer, morning and evening twilight may converge, producing a(n)____, or a nightlong twilight
a. constructive interference
b. false twilight
c. iridescence
d. white night
e. glory
ANSWER: d
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What major industrial power currently generates 20% of its total energy budget from renewable resources?
A) Denmark B) Great Britain C) Germany D) United States E) China
What type of stream is shown in this figure?
A) Braided stream
B) A stream whose channel has a low sinuosity
C) Meandering stream
D) A stream that lacks point bars
E) All of these are correct.
Natural levees are constructed of machine-compacted sand and mud; artificial levees are made of concrete.
a. true b. false
Commercial whaling: a. is not allowed around Antarctica
b. is estimated to have reduced the number of large whales from 10 million in 1900 to 5 million today. c. ended entirely in 1987. d. resulted in the extinction of 8 of the 11 large whales once hunted by the whaling industry.