Frostsprækker dannes i frosne sedimenter, når temperaturen hurtigt falder under -20 / -30 celsius. Under sådanne forhold falder isens volumen, hvilket forårsager spændinger og revner i jorden. Is- og sedimentkorn kan falde ind i revnerne. Sæsonbetingede revner fører til dannelse af frostkiler.
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