A) The dark colored humus found in deep layers of soil, makes soil fertile.
B) Afforestation protects the soil from erosion.
C) Organic manures are less harmful than chemical fertilizers.
D) Overgrazing is one of the causes of soil erosion.
Correct Answer: A
Solution :
Humus is the black coloured organic compound found in topmost layer of the soil which makes soil nutrient rich, thus fertile.
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