In which region is the ozone hole most prominently observed annually?

• A. Arctic
• B. Tropic
• C. Antarctica
• D. Equator

Answer: (C)

The ozone hole is most prominently observed annually over Antarctica. This phenomenon occurs during the Southern Hemisphere's spring, typically reaching its maximum size in September and October. The depletion of ozone in this region is predominantly driven by the presence of human-made chemicals, particularly chlorofluorocarbons (CFCs), which release chlorine atoms in the stratosphere.

Antarctica's unique climatic conditions contribute significantly to the formation of the ozone hole. The extremely cold temperatures over the continent during winter allow polar stratospheric clouds to form, providing a surface for the reactions that lead to ozone depletion when sunlight returns in the spring.

In contrast, the Arctic region does experience some ozone depletion but to a much lesser extent compared to Antarctica due to its warmer temperatures and less stable atmospheric conditions. The tropics and equator do not exhibit significant ozone holes because they do not share the same climatic and environmental conditions that facilitate the dramatic ozone depletion seen over Antarctica.