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Which soil-forming process adds partly decomposed plant and animal remains to the soil?

Answer and explanation

Correct answer: Humification

The correct answer is A, humification. Soil contains mineral particles as well as organic matter. When fallen leaves, roots, dead plants, and animal remains are decomposed by microorganisms, their partly decomposed material changes into a dark organic substance called humus. The process of forming and adding this humus to the soil is humification. Humus improves soil structure, supports nutrient supply, and helps the soil hold moisture. Option B, evaporation, only changes liquid water into water vapour and does not add organic matter. Option C means weathering has stopped, so it cannot form humus. Option D concerns the removal of salts, not the addition of decomposed remains. A useful memory cue is: humification produces humus from dead organic material.

Related tags

Soil FormationHumificationHumusOrganic MatterSoil FertilitySoil Formation ProcessesGeomorphic ProcessesGeography

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