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Why do rocks weahter rapidly in areas were freezing and thawing occur frequently?
Wiki User
∙ 12y ago
The freeze thaw cycle of weathering is important in breaking up the crystal structures in the rock. [The rock itself is of course already frozen.] There are several mechanisms in action in the Freeze Thaw cycle.
Water in the rock's crevices will expand when freezing, thus loosening the tiny crystals. This will allow a greater quantity of water to be held in the crack next wet period, and so on.
The presence of water in the crack will be in contact with fresh minerals on the face of the rock's crystals, and this may dissolve some of the mineral, or it may add water of crystallization. In either case, the resultant product will be of greater volume than previously. Thus enlarging the cracks.
In addition, some of the dissolved salts will dry out on the hanging surface of an rock, and will cause a cavity to develop. Commonly these tend towards hollow spheres, with an obvious salt crust.
And there is a gross effect of spallation. This happens when the rock undergoes thermal expansion or shrinking due to temperature changes. The spalls will first fall off exposed corners of the rock, and in the long run, the rock may become quite rounded. On the ground around the rock mass, these fallen spalls will occur as plates of up to a metre in size, and of slightly curved or shell like form.
Wiki User
∙ 11y ago
Wiki User
∙ 12y agopysical changes
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