For what purpose contour barriers are used?

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To reduce soil erosion due to farming practices

To control overgrazing

To slow down the water movement and reduce its erosive force

To prevent soil erosion by wind

answer is B.

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Detailed Solution

A contour barrier technique for soil and water conservation is used in hilly areas.
Contour barriers are contour strips that intercept descending waters and ground particles.
These barriers slow the movement of water and decrease its erosional strength.
They also filter and trap a large number of soil particles in suspension, preventing them from being carried away from the field.
Stones, grass, soil is used for constructing barriers along the contours.

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