Contour barriers are used in which area to prevent soil erosion?

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Scrub lands, liable to spread of weed growth

None of the above

Desert margins, liable to strong wind action

Low flat plains, close to stream courses, liable to flooding

answer is D.

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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.
This makes it possible to reduce the flow of water along the slope.
A long-term benefit of barriers is that the soil tends to build up behind them, creating a terrace effect.

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