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Frost Wedging

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Answers to Common Questions
Frost wedging is a form of mechanical weathering (that is, weathering that involves physical, rather than chemical change).
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Frost wedging, also known as weathering, is the process of decomposition of the Earth, including its rocks, by the expansion of freezing water.
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Water from frost or rain gets between cracks on a rock. At night this water freezing and expands. The expansion of the water in the cracks causes the rock to break little by little. This cycle is repeated many times.
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Answers to Other Common Questions
Frost wedging is classified as mechanical weathering, but does open up rock to further surface attack by chemical weathering.
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If water can penetrate through a hole in the pavement to a lower layer of pavement, freezing and thawing may force water between the layers separating the layers. Mechanical action of tires may break up the top layer leaving a pothole.
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Because water takes up more space when it freezes. The larger Ice pieces can push up rocks to the surface of the Earth.
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Frost wedging occurs during freeze-thaw cycles. Because Thule is so cold, it would not experience the freeze-thaw cycles in numbers that Butte, Montana would.
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It is the feeze/thaw cycle that makes frost wedging really effective as an erosive force. Desert areas that are warm during the day and freezing at night experience more wedging than permafrost areas.
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