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.
Water expands when it freezes. In winter, water gets into minute cracks in the rocks and then as it freezes it expands and makes the cracks bigger. So more water gets in then freezes so the cracks...
Plant root growth penetrates small cracks and crevices in rock and spreads them further apart with hydraulic action. Root growth can also lift rock, causing fracture to occur. Other plants can attack...