The topmost horizon in most humid region forest soils is the A horizon.

Name: The topmost horizon in most humid region forest soils is the A horizon.
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The topmost horizon in most soils, including those in humid region forests, is the O horizon, which is composed of organic material such as decomposing leaves and twigs. The A horizon, also known as the topsoil, is directly beneath the O horizon and is rich in humus.

The Topmost Horizon in Most Humid Region Forest Soils Is