Discussion
Freeze-thaw weathering is most effective in a climate with
Answer: D
Correct answer: frequent crossings of the freezing point
The damage is done by the alternation, not by the cold: each freezing expands the water in a crack by about nine per cent and prises it wider, and each thaw lets more water in to be frozen next time. Permanently frozen ground gives no cycles, and a permanently warm climate gives none either. The most severe conditions are therefore high mountains and periglacial regions where the temperature crosses zero daily.
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