In a well-developed soil profile, which horizon is the uppermost layer? the c horizon the b horizon the a horizon the parent horizon

The A Horizon

Explanation:

A soil horizon can be define as a layer of soil laying parallel to the surface of the earth. The distinct soil horizons may vary due to difference in composition, texture and color.  The main soil horizons are A, B, C and O. The A horizon is the uppermost soil horizon. It includes the fine grained weathered particles and partially or completely decomposed organic matter obtained from the plant and animals biological wastes.

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