To prevent soil erosion, a farmer plants a hedge across a field. This method works because
The hedge prevents the soil from direct impact of rainwater.
The roots of plants prevent the soil erosion.
The hedge absorbs minerals from the soil, which makes it most compact.
None of the above.
A
The hedge absorbs minerals from the soil, which makes it most compact.
B
None of the above.
C
The hedge prevents the soil from direct impact of rainwater.
D
The roots of plants prevent the soil erosion.
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Solution
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The vetiver grass is grown as a narrow hedge row across the slope of the land that slows down rainfall runoff velocity and filters out soil particles. The vetiver hedges can block the passage of soil. They can keep topsoil on site and, over time, retard most surface erosion. Hedges of this deeply rooted perennial are capable of catching eroded soil and helping to build up terraces that stabilize the site.
Therefore, the correct answer is option B.
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