Why has the Darvaza gas crater (Door To Hell) been burning for decades?
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One thing to consider is that as a structure of that size increases, the volume of its contents remains proportional to the *cube* of the radius, but the rate of burning is proportional to the *square* of the radius. (The burning can only happen at the upper surface, not all throughout the volume.)
That means that the bigger it gets, the longer it can burn for.
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