Water trapped in the cracks and crevices of rocks weakens the rocks because it contracts upon freezing.
False statement: Water trapped in the cracks and crevices of rocks weakens the rocks because it contracts upon freezing.
True statement: Water trapped in the cracks and crevices of rocks weakens the rocks because it expands upon freezing.
Concluding statement
When water is trapped in the cracks and crevices of rocks weakens the rocks because it expands upon freezing, therefore, the given statement is false.