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The main gasses that are released during a volcanic eruption are water vapor, carbon dioxide, nitrogen, sulfur, and lesser amounts of chlorine, hydrogen, and argon. carbon dioâ¦xide, carbon monoxide, sulfur hydrogen.
The C02 was a result of volcanic activities in the Earth's crust, whereas the methane gas (CH4) was produced by the ubiquitous archaea that convert C02 into CH4.