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Lesson -9, Soil erosion and conservation, I.Hard words, 1) Soil, 2) Composition, 3)soil Profile, 4) Top soil, 5) Sub soil, 6) Bed rock, 7) Soil Erosion, 8)Deforestation, 9) Overgrazing, 10) Terrace, Il. Answer the following :1)How is soil formed?, Ans:Soil is formed by the weathering and breaking of rock., 2) What is soil composed of?, Ans:- The soil is composed of gravel, sand, clay particles, humus, bacteria, fungi, water and air., 3)What is soil erosion? What are its agent?, Ans:-The removal of top soil by wind or flowing water is called soil erosion. Its agents are water, wind,, deforestation and overgrazing., 4)Define soil conservation?, Ans:-Protecting the soil from being blown or washed away is called soil conservation., 5)How does overgrazing lead to soil erosion?, Ans:- The animals that graze on the same land year after year, the land becomes bare., 6)How does terrace farming prevent soil erosion?, Ans:-In terrace farming the soil erode from one step gets deposited on the next. This reduces soil, erosion., 7)How can we conserve soil?

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Ans:-*Rows of trees may be planted., *Plant grass in less fertile lans., *Terrace farming, *Built dams and embarkments.