The depletion of ozone is particularly serious at Earth's poles because

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Polar "ice clouds" act as catalysts to convert HCl to ClO, which is a particularly destructive form of chlorine. The cold temperatures in these regions also help to maintain the stability of these reactive molecules, leading to more rapid depletion of ozone. This phenomenon is known as the "ozone hole" over Antarctica. Choices A, B, and C are all incorrect statements that do not have a direct impact on the depletion of ozone at the poles.

The Depletion of Ozone Is Particularly Serious at Earth's Poles