Question

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Answer 1

Answer:

1. Rusting of Iron is more in coastal areas is higher than any desert areas is because in coastal areas the amount of moisture in air is more than compared to desert areas and rusting happens faster when iron comes in contact with high amounts of moisture.
2. The uppermost horizon is generally dark in colour as it is rich in humus and minerals. The humus makes the soil fertile and provides nutrients to growing plants. This layer is generally soft, porous and can retain more water.

Explanation:

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Answer 2

Answer:

1. For rusting, the presence of air(oxygen) and moisture(water) is required. In coastal areas the quantity of moisture present in air is higher than in the deserts. Hence, rusting of iron objects is faster in coastal areas than in deserts.
2. The uppermost layer of soil contains humus. Humus is a dark brown or black coloured organic matter that contains carbon in high concentration. So due to humus the uppermost layer of the soil is dark in colour.

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