A hypothesis can best be described as ________
A) a proven fact
B) a comparison between groups with an explanation for differences
C) the science of asking questions and finding concrete answers
D) an explanation that has been tested many times
E) a proposed explanation that can be tested
Answer: E
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An El Niño usually results in
A. more rainfall for South America B. warmer water in the western Pacific C. less rainfall for Australia D. all of the above
Some countries limit or reduce the overall amount of pollution by letting companies negotiate, buy, sell, and trade the "right" to pollute among themselves. Such a system is based on
A) emissions trading. B) ecocapitalism. C) pollution permits. D) barter bucks. E) pollute-for-profit.
The world's biggest agricultural "land grabber" is
A) China. B) the United States. C) Russia. D) Brazil. E) Pakistan.
How many molecules are contained in a single breath of air?
A. 102 molecules B. 106 molecules C. 1022 molecules D. 1026 molecules