Multiple choice

The major threat to the ozone layer is ______________.

  1. chlorofluorocarbons

  2. CO2

  3. Methane

  4. inert gases
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Chlorofluorocarbons are non-toxic, non-flammable and non-carcinogenic. They contain fluorine atoms, carbon atoms and chlorine atoms. CFCs released into the atmosphere accumulate in the stratosphere, where they have a deleterious effect on the ozone layer. In the stratosphere, the CFC molecules break down by the action of solar ultraviolet radiation and release their constituent chlorine atoms. These then react with the ozone molecules, resulting in their removal.

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