Freeze- thaw Weathering
The action of water freezing and thawing in a crack or hole in a rock. It is common in places with temperature fluctuation above and beneath freezing point and where water is plentiful.
1. Water seeps into pores/ cracks in the rock
2. Water freezes in the rock to form ice- it expands by around 9%
3. The expansion causes stresses in rock and cracks are enlarged
4. Repeated freezing and thawing
5. Eventually rock fragment breaks off and collects as scree at the foot of the rockface
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