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Which of the following is the topsoil in context to solid waste composting?

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+1 vote
in Environmental Biotechnology by (64.7k points)
Which of the following is the topsoil in context to solid waste composting?

(a) Humus

(b) Bed rock

(c) Sub soil

(d) Weathered rock

This question was addressed to me in exam.

I'd like to ask this question from Enzymes Catalyzing Pesticide Degradation Reactions in chapter Biodegradation of Pesticides in the Environment of Environmental Biotechnology

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Best answer
Correct option is (a) Humus

The best explanation: The dark substance in the top layer of the soil which looks like peat and has a powdery texture is humus, sub soil, weathered rock bed rock are the subsequent layers after the top layer.

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