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Answer: Extraneous Variable
Explanation: Extraneous Variable. When we conduct experiments there are other variables that can affect our results, if we do not control them. These other variables are called extraneous or confounding variables.
171 km³ per year.
0.006% = 0.006/ 100 = 0.00006 ;
0.00006 * 2,850,000 km³ = 171 km³ per year.
I think your answer is, B. Please correct me if im wrong.