12. (a) Where is plugging of gullies and ravines practised?
(b) What is sheet erosion and how is it counterbalanced?
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a) Chos of Punjab and ravines of chambal valley.
b) When the top layer of soil gets removed due to the flow of excesive water then it is known as sheet erosion. Sheet erosion can be counterbalanced by afforestation and terrace farming
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