Which of the following is a polynuclear aromatic hydrocarbon with three rings in a linearly fused arrangement?
A) anthracene
B) benzene
C) naphthalene
D) phenanthrene
A
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Because the health and environmental impacts of GMOs are not well-understood,
A) the United States allows GMOs to be used only in research. B) Europe severely limits GMO food imports. C) farmers in the United States refuse to use them. D) they are not widely used and were just another passing fad. E) Europe severely limits GMO food imports, and the United States allows GMOs to be used only in research.
What percentage of the Earth's surface does ice presently cover?
A. less than 1% B. about 5%% C. about 66% D. about 10%
Glacial ice covers what percent of the global land area?
A) 10% B) 30% C) 40% D) 5%
A ventifact can be used to determine the dominant wind direction of an area
Indicate whether the statement is true or false