Changing with the SeasonsAll hydrothermal features change, but Grizzly Fumarole changes from day to day, and season to season, reflecting recent weather conditions.What is Hydrothermal?Hydro = Water       Thermal = HeatDuring dry weather, steam rises from Grizzly Fumarole's mostly dry ventsRain or snow transforms the fumarole into mudpots. A single, large mudpot often appears in Spring.Mudpot or Fumarole?A fumarole or steam vent's underground system is nearly dry. Heated deep below the surface, the water turns to steam, the rises with other gasses.Mudpots are muddy springs. Microorganisms live in mudpots and convert hydrogen sulfide gas from Yellowstone's magma chamber into sulfuric acid. This acid breaks rock and soil into mud.< Sidebar: >Yellowstone's Hydrothermal FeaturesRain and snow seep into the ground. Heated by Yellowstone's magma chamber, the water rises to the surface as a geyser, hot spring, mudpot, or fumarole. Underground water is heated by Yellowstone's magma chamber. Extreme water pressure forces the super-heated water to rise.

Sorry, but we don't have a picture of this historical marker yet. If you have a picture, please share it with us. It's simple to do. 1) Become a member. 2) Adopt this historical marker listing. 3) Upload the picture.

Show me all markers in:  Yellowstone National Park, WY  |  Park County  |  82190  |  Wyoming  |  United States of America

Cooking Hillside
Dragon's Mouth Spring
Mud Volcano
Mud Geyser
Churning Caldron
Black Dragon's Caldron
Volcanic Landscape
Sulphur Caldron
Leaping the Rapids
Off the Hook

• GPX
• KML
• LOC

Have you seen this marker? If so, check in and tell us about it.