Question

Why is the top soil dark in colour ?​

Answer 1

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The uppermost layer of soil is usually darker in colour due to the presence of huge amount of organic matter. Organic matter is composed of roots, dead leaves, insects, small organisms and animals which eventually get degraded to form humus and make the soil fertile.

Answer 2

Answer:

Topsoil tends to be much darker in color since the soil is more fertile than subsoil. This is because the soil is rich in organic matter. Topsoil is more life supporting for living insects, since the soil is directly exposed to the atmosphere and allows for greater exposure due to its small, loose particles.