Mud volcanos (September 6, 2025)

 

Yellowstone mud is dangerous too!

Churning cauldrons of scalding mud and water! Mud geysers! Erupting mud pots (muddy springs of sulfuric acid) blew trees out by the roots in 1948! Fumaroles (nearly dry underground steam vents in the surface)!

Bears, bison, and a dragon's mouth too! Rumbling sounds are caused by steam and other gases exploding through the water, causing it to crash against the walls of the hidden cavern.

Until the 1990s, the dragon spewed steamy water onto the boardwalk. No more, sadly.