A) Flow of water
B) Deforestation
C) Flow of wind
D) Green areas
Correct Answer: D
Solution :
In the absence of plants, soil becomes loose. So it can be moved by wind and flowing water. Erosion of soil is more severe in areas of little or no surface vegetation, such as desert or bare lands. So, cutting of trees and deforestation should be prevented and efforts should be made to increase the green areas.
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