Centrally planned and free-market economies both
A) function best without government regulations.
B) rely upon the self-interests of individuals.
C) represent ideals not found in pure form in any country.
D) depend upon free access to the market.
C
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Natural causes of climate change include variation in
A. the concentration of atmospheric nitrogen. B. Earth's density. C. the amount of water in the hydrosphere. D. the concentration of atmospheric carbon dioxide.
Compared to a nuclear plant, a coal-fired plant
A) emits much less carbon dioxide. B) requires much less mining and results in fewer mining deaths. C) contributes to acid rain, and a nuclear plant does not. D) releases more than 100 times more radioactivity because of radioactive elements in coal.
Neptune and Uranus both appear bluish in sunlight whereas Jupiter and Saturn are multicolored. Why are Neptune and Uranus blue?
A) The effect is not real; it is just due to low light levels. B) They do not contain dust and debris in the atmosphere, like Saturn and Jupiter. C) They contain ice crystals high in the atmosphere, and water ice is blue. D) They contain methane ice in their atmosphere which causes the color.
Glaciers form only near the poles.
Answer the following statement true (T) or false (F)