In addition to its famed geysers, Yellowstone is dotted with these geological features, in which steam vents out into the air. What are these features called?

One of the active areas containing fumaroles in Yellowstone is called Roaring Mountain, where you can hear the sound of the steam passing through the water table. As the steam rises, it carries volcanic gases such as hydrogen sulfide to the surface.

Asked by Tom Cohen · Last updated 5 years ago · 2.9K views