Which of the following chemicals is implicated in both global warming and ozone depletion?
A. chlorofluorocarbons
B. methane
C. carbon dioxide
D. sulfur dioxide
Answer: A
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When the tiny hole in a pinhole camera is made larger, the image is
A. clearer. B. brighter but less clear. C. right-side up. D. none of the above
Volcanic domes commonly are partially destroyed when
A) gases are released slowly out the top of the dome, dissolving it. B) steep parts of the dome collapse and cause small pyroclastic flows. C) fast-moving, low-viscosity lava carries away part of the dome. D) the center of the dome collapses, forming a composite volcano. E) All of these are correct.
Geologists have a very good record of the breakup of Pangaea because of ____
A)extensive guide fossils B)preservation of the continental crust from the Mesozoic C)the high rate of seafloor spreading during the Mesozoic D)extensive evaporite deposits E)magnetic anomalies preserved in oceanic crust
Humus has a consistency not unlike that of ________
A) putty B) sponges C) gelatin D) rock E) roast beef