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Q.

The method of soil conservation in which rocks are piled up to slow down the flow of water which prevents gullies and further soil loss is called?
Explanation:

ANS. (C) 
The method of soil conservation in which rocks are piled up to slow down the flow of water which prevents gullies and further soil loss is called rock dam. It aims to reduce erosion in a drainage channel by restricting the velocity of flow in the channel.

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