Fantastic gas, part 2: what would be the source of a subterranean gas that's not organic in origin?
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Natural gas comes can be found in the underground, but its origin are the organic rests of a long time ago. However, my gas doesn't come from dead trees or anything like that. So what's an alternative source?
I'm thinking maybe the gas comes from underground pools of its liquid form, and evaporates when heated by an hotspot or an incoming volcanic eruption. But this poses the question of where the liquid comes from. Any ideas?
Thanks in advance.
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