What gas is produced naturally in the stratosphere and is also a primary component of photochemical smog in polluted air at the surface?
a. ?carbon dioxide
b. ?carbon monoxide
c. ?ozone
d. ?nitrogen dioxide
e. ?hydrocarbons
ANSWER: c
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What occurs during a major El Niño event? How might this affect global wind and precipitation patterns?
What will be an ideal response?
What has been the trend in human evolution since the appearance of the Cro-Magnons?
a. Several small subspecies have appeared, acclimated to mini-environments. b. Evolution has proceeded slower than usual. c. Evolution has become cultural rather than biological. d. Peripheral speciation has resulted in the emergence of the Neanderthals.
e. Size of organisms has steadily decreased.Which of the following is a clear advantage in the use of nuclear power instead of fossil fuels?
A) Nuclear plants are cheaper to build than power plants that burn fossil fuels. B) Nuclear power can be used today to power most forms of public transportation. C) Nuclear power contributes less to global climate change. D) Nuclear power generates fewer wastes with lower health risks.
The wind around a surface low pressure center in the Southern Hemisphere blows
a. counterclockwise and outward from the center. b. counterclockwise and inward toward the center. c. clockwise and outward from the center. d. clockwise and inward toward the center. e. clockwise and either outward or inward.