GK
SOIL EROSION AND CONSERVATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Four
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Three
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Two
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One
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Detailed explanation-1: -The gully development is recognized in four stages: Formation Stage: Scouring of top soil in the direction of general slope occurs as the runoff water concentrates. It normally proceeds slowly where the top soil is fairly resistant to erosion.
Detailed explanation-2: -Gully erosion occurs when water is channelled across unprotected land and washes away the soil along the drainage lines. Under natural conditions, runoff is moderated by vegetation, which generally holds the soil together, protecting it from excessive runoff and direct rainfall.
Detailed explanation-3: -There are four stages of water erosion: (1) raindrop or splash erosion, (2) sheet erosion, (3) rill erosion, and (4) gully erosion.
Detailed explanation-4: -The classification of gullies based on shape is shown in Fig 2. U-Shaped: These are generated when the erosion resistance of the topsoil and subsoil is equal. Because the subsoil erodes at the same rate as the topsoil, virtually vertical walls form on both sides of the gully.