Final answer:
Deforestation is not a method to prevent soil erosion, while contour ploughing and terrace farming are effective techniques to reduce soil erosion.
Explanation:
Deforestation is not a method of checking soil erosion. It actually contributes to soil erosion by removing trees that help stabilize the soil. On the other hand, contour ploughing and terrace farming are effective methods to reduce soil erosion by controlling water runoff and preserving the soil structure.
Learn more about Soil erosion and conservation practices here:
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