During the process of soil formation when water gets into the cracks in the rocks formed by heat of sun , and then later freezes then how dose it widen the cracks ?

Water too aids in the process of soil formation. It enters the rocks through the cracks in them and freezes at low temperatures. This expands and contracts the rocks, which results in the breaking down of the rocks. Another way in which water helps in the formation of soil is when running water flows along rocks. The flow of water along the rocks creates a friction between water and rocks, which results in the weathering of rocks. This leads to the formation of soil. The soil thus formed may flow along with the water and get deposited elsewhere.