Yellowstone National Park: bubbling boiling mud

Family, bison and bubbling mud, what a place to be together.

Mud Volcano, a hydrothermal zone along the Grand Loop and an bleak, ominous place of bubbling mud that made me feel anxious.

Interesting that hot springs and geysers did not have the same scary impact as did the mud.

Roiling muddy water, rather than boiling. Escaping gases cause the mud to roil.

Vast mud cauldron

The remnants of the Mud Volcano.

Dragon's Breathe, noisy, steamy and water that rumbles underground and comes to the surface in waves.