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Which soil horizon is primarily composed of recent organi... | QuestionStock

Representative image for question: Which soil horizon is primarily composed of recent organic litter such as fallen leaves, twigs, and decomposing plant material?

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Which soil horizon is primarily composed of recent organic litter such as fallen leaves, twigs, and decomposing plant material?

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Which soil horizon is primarily composed of recent organic litter such as fallen leaves, twigs, and decomposing plant material?

Options:

O horizon
A horizon
B horizon
C horizon

Correct answer: O horizon

Explanation: The O horizon is dominated by organic litter (leaf litter and humus); in many forest soils it typically measures a few centimeters to several tens of centimeters thick and fuels nutrient cycling.

Created 2026-03-10T17:16:12.601Z. Updated 2026-03-10T17:16:12.601Z.