Discussion
Which one of the following is the major cause of ozone layer degradation?
Answer: B
The major cause of ozone depletion is CFCs (chlorofluorocarbons).
CFCs released from refrigerants, aerosols and foams rise into the stratosphere, where ultraviolet light breaks them apart and frees chlorine atoms. Each chlorine atom can destroy thousands of ozone molecules, which led to the Antarctic ozone hole and to the Montreal Protocol of 1987.
Carbon dioxide is a greenhouse gas, oxygen is the raw material from which ozone forms, and the last option is not a stable atmospheric gas.
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