Question

why the uppermost horizon is dark in colour ​

Answer 1

Answer:

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Explanation:

The uppermost horizon is dark in colour because it is rich in humus and minerals. The humus makes soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water. It is called the topsoil or the A- horizon.

Answer 2

Explanation:

Horizon: The uppermost horizon is dark in colour because it is rich in humus and minerals. The humus makes soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water. It is called the topsoil or the A- horizon.

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