Gas escaping from a mudpot at Yellowstone creates an ephemeral spherical bubble. Mudpots form in hydrothermal systems where the gas phase dominates the thermal system in areas of intense, clay-rich hydrothermal alteration.

Copyrighted photo by Katia and Maurice Krafft, 1984.

Copyrighted image used with permission. All Rights Reserved. Contact photographer for any usage requests.

Yellowstone