The dominant agent of weathering in the rain forest region of Nigeria is

Answer Details

The dominant agent of weathering in the rain forest region of Nigeria is chemical weathering. In tropical rain forests, two conditions strongly favour chemical weathering processes over mechanical or biological weathering:

• High temperatures accelerate the rate of chemical reactions. For every 10 degrees Celsius rise in temperature, the rate of most chemical reactions roughly doubles.
• Abundant rainfall provides the water necessary for chemical reactions such as hydrolysis, oxidation, carbonation, and solution to take place continuously.

The major chemical weathering processes active in the rain forest include:

• Hydrolysis - water reacts with minerals (especially feldspars) to form clay minerals
• Oxidation - iron-bearing minerals react with oxygen dissolved in water, producing the reddish laterite soils characteristic of tropical regions
• Carbonation - carbon dioxide dissolves in rainwater to form weak carbonic acid, which dissolves carbonate rocks
• Solution - soluble minerals dissolve directly in water

Organic acids from the decomposition of abundant leaf litter further enhance these chemical processes. While water and plants are physically present, the dominant type of weathering they drive in the humid tropics is chemical, not merely mechanical.