NCERT Solutions for Class 9 Science Chapter 8
Important NCERT Questions
7th Chapter 9 Force and Laws of Motion
NCERT Books for Session 2022-2023
CBSE Board and State Board
Questions No: 4
Explain how soil is formed.
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Over thousands of years, smaller pieces of rocks changed into soil under the combined effect of water, wind, roots of plants, temperature variations and mechanical collisions.
Soil is formed by weathering of rocks. Weathering is the breakdown of rocks by the action of air, wind and water. Soil formation is a slow process. It occurs all the time. Soil formation is a two-step process:
• Weathering of rocks takes place. Rock is broken down into small particles.
• These small particles mix with humus (organic matter) and form soil.
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