Single correct option
The depletion of the ozone layer in the stratosphere is mainly caused by
- A. carbon monoxide
- B. methane
- C. sulphur dioxide
- D. chlorofluorocarbons
Show answer and solution
Answer: (D) chlorofluorocarbons
CFCs rise to the stratosphere, where ultraviolet radiation releases chlorine atoms. These atoms catalytically destroy ozone molecules. Carbon monoxide, methane and sulphur dioxide pollute the lower atmosphere or contribute to global warming and acid rain, rather than the ozone hole.
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