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21 February, 15:34

There are many sources of air pollution in the united states and around the world. Some are natural sources, and other come from human activities. Which of these examples is a natural source of air pollution?

A.) car exhaust fumes

B.) methane gas from cow manure

C.) dust from fertilizers used on crops

D.) smoke from the burning of fossil fuels

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Answers (1)
  1. 21 February, 15:57
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    B should be your best guess
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