Discussion
Which condition allows the Antarctic ozone hole to form?
Answer: A
Temperatures below about 195 kelvin allow polar stratospheric clouds to form, and their surfaces convert reservoir chlorine species into forms that photolyse readily when sunlight returns. The isolation of the vortex prevents replenishment. The rapid loss then occurs in spring, which is why the hole appears in September and October rather than in midwinter darkness. A limit that survives making every external component ideal is an intrinsic one, and worth knowing for that reason.
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