description Roaring Mountain fumaroles Overview
The Roaring Mountain fumaroles are steam vents on a large acidic hydrothermal area in Yellowstone National Park, Wyoming. The feature lies north of Norris Geyser Basin and contains fumaroles across a treeless, altered slope beside the road between Norris and Mammoth. Their hissing and roaring sounds result from pressurized steam and volcanic gases escaping through the ground, where limited water boils before reaching the surface.
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