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29/10/2021 11:42 am
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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 topsoil is
(1) rich in iron, calcium and magnesium
(2) more moisture
(3) recent formation
(4) rich in organic matter
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29/10/2021 11:46 am
Correct answer: (4) rich in organic matter