What is the term for partially decomposed material on the forest floor?

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Multiple Choice

What is the term for partially decomposed material on the forest floor?

Partially decomposed material on the forest floor is ground duff. It sits directly on the mineral soil and has begun to break down, forming a loose, spongy layer that differs from fresh, largely undecomposed forest litter (leaves, needles, and twigs that haven’t degraded much yet). Mulch is material placed by people for gardening, not a natural forest floor layer. Ground duff is the best term for the described material because it specifically describes the partially decomposed organic matter that remains on the forest floor.

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