It isn't lava, well at least the blue part isn't. It is molten sulfur igniting as it hits the atmosphere, creating a blue flame that is more visible than the bright yellow molten sulfur.
Molten sulfur is amazing stuff, it looks like melted butter, with a
temperature at least of 125C, so don't touch. It's also fairly sticky
so touching it means at least a second degree burn. Once you
light it you get SO2 which is the rotten egg smell.
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