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A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil is

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A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil is
A. More moisture
B. Rich in organic matter
C. Rich in iron, calcium and magnesium
D. Recent formation
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(B) A fertile agricultural soil appears deep coloured at the surface as compared to soil one metre down. The reason for colour of top soil is rich in organic matter.
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