Nitrogen dioxide (NO2) reacts with ____ in the atmosphere to form nitric acid (HNO3)
a. hydrogen
b. water vapor
c. ozone
d. carbon dioxide
e. sulfur dioxide
ANSWER: b
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This volcano is broad and low, and is composed of basaltic lava flows. What kind of volcano is it?
A. caldera B. scoria cone C. volcanic dome D. shield volcano E. composite volcano
Which of the following deep-water fish was originally called the toothfish and is now on the Seafood Watch List of fish to avoid purchasing?
A) Alaskan Salmon B) Australian Slimehead C) Chilean Seabass D) Greenland Halibut E) Orange Roughy
Which of the following is the most true?
A. At this time, soil is eroding in the U.S. about 10 times faster than it is forming. B. The most important agent of soil erosion is winter frost heave. C. Very little farmland in the United States has experienced moderate to severe erosion lately. D. Soil erosion is always easily reversible, using conservation techniques.
When the universe originated, it was composed of 100% ____________________ and
____________________, but now consists of ____________________% hydrogen and 2% ____________________ elements. Fill in the blank(s) with the appropriate word(s).