The greenhouse effect
A) occurs because the atmosphere is opaque to shortwave radiation from the Sun.
B) relies on the longwave absorption and emission properties of the atmosphere.
C) is enhanced by decreased carbon dioxide concentrations.
D) cools the Earth.
E) has only occurred during the last twenty or so years.
B
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Indicate whether the statement is true or false
All of the following are important aspects of sustainable forestry except
a. no logging of old-growth forests b. no clear-cutting on steep slopes c. reduce road-building into uncut forest areas d. rely more on clear-cutting e. certify timber grown by sustainable methods
When 500-N Danny Diver steps off a diving board that is 10 m above the water, he hits the water with kinetic energy of
A. 510 J. B. 500 J. C. 10 J. D. 5000 J.
On a clear, windy day, the depth to which mixing occurs above the surface depends upon
a. ?wind direction. b. ?surface heating. c. ?precipitation type. d. ?cloud coverage. e. ?nuclei types in the atmosphere.