Certain types of rocks that have a porous structure, like pumice and sandstone, are easily inundated with water; each little hole in the rock structure acts like a little reservoir trapping moisture. However, the more porous the rock is, the more likely water will simply pass through it rather than remain in the stone for a long time. One such way moisture remains in these types of rocks, as well as in the cracks of different, less porous rocks like granite, is in freezing temperatures. Ice, unlike water, can remain trapped in a rock for as long as temperature permits, which has another effect on the rocks; as water freezes it expands and acts as a growing wedge between the crack until the rock may actually fracture further.
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