Weathering is a phenomenon in which rocks break down and the surface minerals are loosened up. This causes the rock to be transported away by the agents such as water, ice, and wind.
The freezing or partial thawing of water trapped in the rocks will cause them to weather because given the proper temperature, they will freeze. Freezing of water causes it to expands, needing more volume to occupy and thus, breaking the rocks. From the given choices above, the best answer to this item is therefore the second choice.
