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The dark, humus-rich uppermost soil layer is the:

ABedrock
BA-horizon
CB-horizon
DC-horizon
Answer & Solution
Correct answer: B. A-horizon
1. It is soft, porous and holds water. 2. The topsoil is the A-horizon. 3. Worms, rodents and beetles live in it. _Source: syllabus Science, Chapter 9, Soil._
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