freeze-thaw weathering

freeze-thaw weathering
  a process of physical or mechanical weathering. In areas which experience a diurnal temperature range above and below 0蚓 then water is frozen and thawed on a daily basis. As it expands when freezing, it can widen cracks in which it is held which then capture more water during the thaw period. This is repeated until the stresses within the rock cause it to fracture.

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