Explain the role of the Sun in the formation of soil.

The rocks are heated by the sun during the day time which cause them to expand; they contract during night but not at same rate —resulting in cracks in rocks and ultimately to smaller particles.

Hint— The rocks are heated by the sun; they contract during night but not at same rate —resulting in cracks in rocks and ultimately to smaller particles.

Sun plays an important role in weathering of rocks for soil formation. It heats up the rocks during the day.
Heating causes the rocks to expand. During night the rocks cool down and contract. Different parts of a rock expand and contract at different rates resulting in its cacking and breaking up into smaller pieces or fragments (boulders).