Question

Explain the role of sun and rainfall in weathering of rocks.

Answer 1

Action of sun on weathering: During daytime, the heat from the sun causes the rocks to expand. During night, the rocks cool and contract. This uneven expansion and contraction causes cracks in the rocks.

Action of rainfall on weathering: When it rains, the rain water enters the cracks. In winter, these rain water in the cracks freezes and forms ice. Ice in these crevices expands and breaks down the rocks into smaller pieces. In addition, fast-moving water, waterfalls and rivers breaks the rocks into smaller pieces.