What had the most influence in irreversibly changing the Earth's atmosphere?
a. Formation of carbonic acid in the ocean
b. Production of oxygen from photosynthesis
c. Chemical breakup of water vapor by sunlight
d. Fluctuation in the atmospheric composition
ANS: B
Although all these factors did occur, the addition of oxygen to the atmosphere changed the atmosphere
forever. It was called the oxygen revolution. As more and more photosynthetic organisms evolved,
more oxygen was added into the atmosphere. Information can be found in the section Earth, Ocean,
and Atmosphere Accumulated in Layers Sorted by Density.
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The principle of interposition in visual perception suggests that
A. An object with an incomplete outline appears behind another. B. An object with an incomplete outline appears at the same level as another. C. An object with an incomplete outline appears in front of another.
It took more than 100 years for the world’s population to double from 1 billion to 2 billion. How long did it take for the world’s population to increase from 4 billion to 5 billion?
a) Fewer than 15 years as the result of exponential growth b) Half the time of the first doubling, about 50 years c) More than 100 years; 1 billion people are added each 100 years d) The world’s population has not yet reached 5 billion
What water policy, advocated by the World Bank and International Monetary Fund, has made it more difficult for some people to gain access to water?
A) government regulation B) the Kyoto Protocol C) irrigation D) privatization E) U.N. Convention on the Law of the Sea
The March 1993 "storm of the century" was most like a(n)
A) nor'easter. B) Alberta clipper. C) supercell thunderstorm. D) derecho. E) blue norther.