A. Volcanic eruptions and lightening discharges
B. Biological decay of vegetable matter
C. Photochemical oxidation of organic matter
D. None of these
Correct Answer: None of these ✔
Last Updated: March 11, 2019
A. Volcanic eruptions and lightening discharges
B. Biological decay of vegetable matter
C. Photochemical oxidation of organic matter
D. None of these
Correct Answer: None of these ✔
Last Updated: March 11, 2019