Moderate
Mineral soil contain organic carbon___________________?
Correct answer: C. <20%
- A. >4%
- B. 5%
- C. <20%
- D. >10%
Explanation
Mineral soils are conventionally distinguished from organic soils by having less than 20% organic material in basic soil classification. The wording says organic carbon, although many textbooks state this cutoff for organic matter.
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