Frost action cause crack to appear in rock
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Mechanical weathering physically breaks up rock. One example is called frost action or frost shattering. Water gets into cracks and joints in bedrock. When the water freezes it expands and the cracks are opened a little wider.
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Frost cracking, also termed frost splitting and frost riving (q.v.), occurs when moisture soaks down into joint and cleavage crevices of hard rocks during the thaw season. The water freezes when the temperature is sufficiently lowered; ice expansion causes the rocks to split.
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