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Perhaps the rising air in the mine can be compared with
rising water and steam from a geyser. As the water is heated
by the high temperatures (far above water's boiling point)
below the surface it drives out the cool water near the surface
with an almost explosive force. The temperature of the
air above the surface is irrelevant.
Herb Gottlieb from New York City
(Where geysers errupt when water mains rupture)