During the twentieth century, world life expectancies have
A. more than doubled.
B. not increased dramatically.
C. more than tripled.
D. None of these choices are correct
Answer: A
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Discuss the potential ramifications of the United States' restricting the importation of Chinese goods in order to put pressure on the Chinese government for human-rights reforms?
What will be an ideal response?
The extinction of the dinosaurs was likely caused by
A) a massive volcanic eruption. B) an asteroid impacting Earth. C) a substantial diminishing of the Sun's energy output. D) changes in the eccentricity of Earth's orbit. E) changes in the obliquity of the Earth.
The San Andreas fault in California is not a simple crack but ________.
A. exists as a single line of breakage along most of its length B. exists as a zigzag crack along most of its length C. shows little offset on the surface but greater offset below the surface D. is not connected to other fault systems E. a belt of broken and ground-up rock, usually 100 m or more in width
Which of the following is a correct example of global warming creating a positive feedback?
A. Warming oceans release more water vapor, a potent greenhouse gas which absorbs longwave radiation, further increasing temperature. B. Warming oceans release less water vapor, a potent greenhouse gas which absorbs longwave radiation, further increasing temperature. C. Less water evaporating will create more high level clouds, causing the surface to warm. D. Warming air melts permafrost releasing methane, a natural absorber of potent greenhouse gases.