Which of the following oil spills was not caused by a tanker accident?
A) Prestige B) Deepwater Horizon
C) Valdez D) All of the choices were tanker accidents.
B
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Zero magnetic force acts on a current carrying wire when it
A. is perpendicular to the magnetic field. B. carries a very small current. C. either or both of these D. none of the above
What element do astrobiologists consider to be the most essential for the evolution of life?
A) carbon B) silicon C) oxygen D) hydrogen
Approximately 125,000 years ago, temperatures were warmer than current temperatures, yet atmospheric CO2 were lower than present. How do scientists account for this lower-than-expected atmospheric CO2 concentrations?
A) Much higher photosynthetic activity due to differences in plant life. B) Dilution of atmospheric CO2 by large inputs of water vapor from increased evapotranspiration. C) Absorption of excessive CO2 by oceans. D) Linking the higher temperatures to causative factors other than CO2 concentrations. E) Scientists do not account for the difference, indicating that anthropogenic climate change is a hoax.
Pipe insulation and vinyl ceiling and floor tiles may be sources of
a. chloroform b. formaldehyde c. carbon monoxide d. asbestos e. sulfur dioxide