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B
Manuring
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C
Ploughing
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D
Mixed cropping
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Solution
The correct option is A Terracing Soil erosion is removal of top soil by agency of water (water erosion) and wind (wind erosion). One of the methods for soil conservation against soil erosion is terracing. In terracing, slope is divided into a number of flat fields for slowing down the flow of water. Terracing is very effective in hilly areas for control of soil erosion.