Answer the following questions briefly.
1. How is humus formed?
2. Give two differences between sandy soil and loamy soil.
3. Mention two ways by which a farmer's field could get eroded.
4. What is weathering? List the different types of weathering.
5. How is soil classified based on its absorption capacity? Give one property for each type.
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Human evolution is the lengthy process of change by which people originated from apelike ancestors. Scientific evidence shows that the physical and behavioral traits shared by all people originated from apelike ancestors and evolved over a period of approximately six million years.
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