Acid soils of the world's arable comprise up to_____________________?
Correct answer: A. 40%
- A. 40%
- B. 30%
- C. 58%
- D. 20%
Explanation
About 40% of the world's arable soils are commonly reported as acidic, mainly because of leaching in humid regions. The figure refers to arable land, not the percentage of the entire Earth's land surface.
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