Q. 13

How does soil formation takes place in nature? Explain.

Answer :

Soil formation in nature takes place by weathering of rocks by mechanical, chemical and biological methods.

Physical/Mechanical- Breakdown of rocks into smaller pieces. The rocks get heated up during the day and it cools down during night. This expansion and contraction due to heating and cooling of rocks lead to splitting of rocks. Water might enter the rocks in the cracks made by expansion and contraction. When this water freezes, the rocks widen and thus rocks break.

Chemical- it occurs when rocks are worn away by chemical changes like the chemicals released by lichens. These chemicals cause the rock surface to powder own which forms layers of soil

Biological- Disintegration of rocks by activities of living organisms like plant grow in the cracks of rocks thus breaking the rocks

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