Difficulty: Easy
Correct Answer: Seasonal thinning/depletion of stratospheric ozone, especially over Antarctica
Explanation:
Concept / Approach
The “ozone hole” describes markedly reduced ozone concentrations in the stratosphere during spring over polar regions (especially Antarctica), driven by catalytic destruction involving halogen radicals (from CFCs/halons) on polar stratospheric clouds.
Clarification
It is not a physical hole; it is a region of thinning measured as decreased total column ozone (Dobson Units).
Final Answer
Seasonal stratospheric ozone depletion (not a literal hole).
Discussion & Comments