Which of the following statements is true?
A. Overall, in the past twenty years, air pollution conditions have steadily decreased in most North American and Western European cities.
B. Nearly all emissions of sulfur compounds are anthropogenic.
C. Volatile organic compounds are produced exclusively by human activity.
D. Most carbon monoxide produced in the United States comes from internal combustion engines (cars).
E. None of these is correct.
Answer: D
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A) elements with an atomic number greater than that of uranium B) urine C) gamma rays from distant parts of the solar system, beyond Uranus D) transuranic acid
When did fair trade concerns begin to influence the coffee economy?
A) 1960s B) 1970s C) 1980s D) 1990s E) 2000s
Evidence for the Big Bang is
A) the long wavelength radiation that permeates the universe. B) the slowing down of galaxies as they recede. C) both of these D) neither of these
Large areas of Russia are dominated by:
A) Coniferous forest B) Desert shrub C) Tropical savanna, mixed grassland and woodland D) Tropical forest