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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

1. more moisture
2. rich in organic matter
3. rich in iron, calcium and magnesium
4. recent formation

Correct answer: rich in organic matter

Solution

Topsoil is darker because it contains more humus, the decomposed organic material from plants and animals. Humus gives soil a rich dark colour and is common in fertile agricultural soil.

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