Freeze-thaw weathering
1. In some areas, the temperataure is above 0 degrees celcius during the day, and below 0 degrees celcius at night.
2. During the day, water gets into cracks in rocks, e.g granite
3. At night, water freezes and expands, which puts pressure on the rock
4. The water thaws the next day, releasing the pressure, then refreezes the next night
5. Repeated freezing and thawing widens the cracks and causes the rocks to break up
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