What process enlarges cracks in rocks when water freezes and expands?

What process enlarges cracks in rocks when water freezes and expands?

• A. Freezing water expansion
• B. Frost wedging
• C. Erosion
• D. Thermal expansion

Answer: (A)

Enlargement of rock cracks through freeze-thaw cycles occurs when water enters cracks, freezes, and expands. The expansion of freezing water pushes against the surrounding rock, slowly widening the crack. With repeated freezing and thawing, those cracks grow larger until the rock eventually splits apart. In geology, the name for this process is frost wedging, which captures the specific mechanism of crack growth caused by freezing water. The idea of freezing water expansion describes what happens, but frost wedging is the established term for this weathering process. Erosion describes wearing away by moving water or wind, and thermal expansion refers to expansion from heating, not the repeated freeze-thaw widening of cracks.

Enlargement of rock cracks through freeze-thaw cycles occurs when water enters cracks, freezes, and expands. The expansion of freezing water pushes against the surrounding rock, slowly widening the crack. With repeated freezing and thawing, those cracks grow larger until the rock eventually splits apart. In geology, the name for this process is frost wedging, which captures the specific mechanism of crack growth caused by freezing water. The idea of freezing water expansion describes what happens, but frost wedging is the established term for this weathering process. Erosion describes wearing away by moving water or wind, and thermal expansion refers to expansion from heating, not the repeated freeze-thaw widening of cracks.