The decline in the thickness of the ozone layer is caused by:
Correct answer: D. Increasing levels of CFCs
- A. Increasing levels of nitrogen oxide
- B. Decreasing level of O2
- C. Decreasing level of CFCs
- D. Increasing levels of CFCs
Explanation
An increase in CFC gas is responsible for the deterioration of the ozone layer. 'When chlorofluorocarbons (CFC) drift upwards towards the stratosphere, they come in contact with the Ozone layer. This leads to a chemical reaction where the CFC molecules are broken up by ultraviolet radiation, releasing chlorine atoms, which are able to destroy ozone molecules.' (via. byjus.com)
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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