Explain how soil is formed?
Answers
Answer: Soil is formed by weathering of rocks. Weathering is the breakdown of rocks by the action of air, wind and water. ... Rock is broken down into small particles. These small particles mix with humus (organic matter) and form soil.
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answer :::
Soil is formed by a process called weathering.
The process of weathering occurs as a result of the action of wind, water, or climatic changes.
Weathering is the process that breaks down large rocks into smaller pieces.
These small pieces of rocks form soil by mixing with decaying plants and animal parts.
Physical Process:
The Sun: The sun heats up rocks during the day so that they expand. At night, the rocks cool down and contract. This unequal expansion and contraction break up rocks into smaller pieces.
Water: Water can get into the cracks formed in the rock due to uneven heating by the sun. If the water freezes, it will widen the rocks. Also fast flowing water carries big and small particles of roc downstream, causing breakdown of rock in to smaller particles.
Wind: Strong winds erode rocks down.
Chemical Process:
Lichens grow on surface of rocks release chemical substances which cause the rock surface to powder down and form thin layer of soil.
Biological Process:
Living organisms: Some small plants grown in the cracks of rocks and the roots of big trees break the rocks.