The most common type of mechanical weathering occurs when

c.

Explanation:

This process is known as frost weather or frost wedging and happens on a yearly basis in many mid-latitude locations. In the subpolar and polar regions, frost wedging can be a daily occurrence.

The weather happens in two stages. First, water droplets squeeze into pore spaces of the soil or in tiny existing fractures in rocks. Because water expands when it freezes, the crystals of water become enlarged and force the rock apart slowly.