Which of the Following Statements About the Ozone Layer and Ultraviolet

Which of the following statements about the ozone layer and ultraviolet light is true?

A) Nearly all UV-A is screened out by the ozone layer.
B) For each 1 per cent decrease in ozone, UV-B reaching the earth's surface increases by 2 per cent.
C) Chlorofluorocarbons (CFCs) react with ozone in a reversible reaction.
D) The thinning of the ozone layer is most pronounced in the tropics.
E) UV-C has the longest wavelength and is poorly absorbed by the ozone layer.

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