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GS Geography Physical Geography of World
Q.

The method of soil conservation in which stones, grass, soil is used to build barriers along contours and trenches are made in front of the barriers to collect water is called?
Explanation:

ANS. (B) 
In contour barriers method, stones, grass, soil are used to build barriers along contours, while trenches are made in front of the barriers to collect water. They intercept downslope flowing water and soil particles. These barriers slow down the water movement and reduce its erosive force. They also filter out and trap many of the suspended soil particles, keeping them from being washed out of the field.

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