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The stratospheric ozone layer needs safeguarding against the unchecked use of which of the following?

1. balloons
2. pesticides
3. atomic explosions
4. aerosols and high-flying jets

Correct answer: aerosols and high-flying jets

Solution

The stratospheric ozone layer is endangered by chlorofluorocarbons from aerosols and by oxides of nitrogen from supersonic/high-flying jets. Pesticides do not deplete stratospheric ozone.

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