What factor affects the rate of humus formation?

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Vegetation

Temperature changes

Parent rock

Relief

answer is A.

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Detailed Solution

Humus gets enriched by vegetation. Hence, vegetation affects the rate of humus formation in the soil. Humus is the organic content of the soil that can get enriched by the presence of vegetation. Thus, the vegetation and forest cover at a place decide the soil's humus content. Chemical and organic changes also play a vital role in soil formation. The process of soil formation is complex, taking millions of years to complete by weathering and disintegrating rocks. The parent or bedrock plays a role in determining the characteristics of the soil. For example, black soil has igneous rocks as its parent, giving it the water-retention property. The relief, climate, temperature, pressure, and precipitation affect the formation of soil and its nutrient and humus content.

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