Water trapped in crevices of rocks tends to break them up because water _________ upon freezing.

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Solution

Rainwater is trapped inside small cracks and crevices in rocks. In cold regions, this water freezes and water expands upon freezing, so the cracks become wider. Next time more water is trapped and this widens the crack even more upon freezing. Eventually the rock breaks.
Concluding statement
Water trapped in crevices of rocks tends to break them up because water expands upon freezing.

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