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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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.
https://www.tiwariacademy.com/ncert-solutions/class-7/science/chapter-9/
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.