MCQOPTIONS
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| 1. |
Permafrost, a permanently frozen soil, found in high altitudes is melting due to global warming. Which of the following gases are released from its melting? |
| A. | Ozone and methane |
| B. | Hydrogen and ozone |
| C. | Nitrogen oxide and hydrogen |
| D. | Carbon dioxide and methane |
| Answer» E. | |