The best way to address outdoor air pollution is to ________
A) use less polluting energy sources
B) use high sulfur content coal
C) install scrubbers on smoke stacks
D) build high smoke stacks
E) use automobiles without catalytic converters
Answer: A
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The statement, "There are regions beneath Earth's crust that will always be beyond the reach of scientific investigation," is a
A) fact. B) speculation. C) hypothesis. D) scientific statement. E) theory.
The polar jet stream is embedded within the upper:
a. easterlies. b. westerlies. c. trade winds. d. monsoon winds.
The world's largest city in 2013 was:
A) New York City B) Mexico City C) Tokyo D) Shanghai
European relations with Russia became strained after the Russian invasion of what country in 2014?
a. Lithuania b. Ukraine c. Albania d. Macedonia e. Estonia