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Why is CFC depletion of the ozone layer a theory and not a scientific law?

April 26, 2017CFC depletion Law ozone scientific Theory

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Why is CFC depletion of the ozone layer a theory and not a scientific law?

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Observations were made that CFC “fragments” were found in areas of low ozone concentration. The assumption was made that CFCs contributed to ozone depletion. CFCs were then tested in the lab to see if they: contributed to ozone depletion (they do), and were persistent (they are).