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The numerous boiling mud springs characterize some areas of Yellowstone Park and testify to the volcanic character of the area.
Zulfugarli, Istisu springs, Kalbajar rayon, Azerbaijan: Istisu hot springs, 'isti su' is Azerbaijani for hot water, so a common toponymic, located between the Turthun river and the forest.
Hokkaido, Japan - October 13, 2023: mud volcano Bokke of Akan lake in Hokkaido, Japan
Bumpass Hell area of Lassen Volcanic National Park in California. Part of the Cascade Mountain Range. Dried hot springs next to the Boiling Springs Lake. Dried mud forming cracks.
Close-up of the earth surface in the Orakei Korako Park, Taupo, North Island, New Zealand, Oceania.\nRainbow Terrace in the Orakei Korako Geothermal Park, Taupo Volcanic Zone.
Gas bubbles to the surface and causes the mud to fly in the air.  Waiotapu Thermal Wonderland, near Rotorua on the North Island of New Zealand.
Semi-thermal area, geothermal fluid. Mineral hot springs is confined to post-volcanic phase. Mineral hot springs, chemical mixture: yellow sulfur powder, white ammonium chloride, yellow iron chloride
Jewel Geyser at Biscuit Basin on Upper Geyser Basin in Yellowstone National Park, Wyoming
Sikidang crater with the background of sulfur vapor coming out of the sulfur marsh.
Old Faithful Yellowstone National Park, Wyoming, USA.
The pool at night and steam rising from the pool.
Close up on steaming mud pot
Caldeira do Esguicho; Traditional furnas sweet corn cobs cooked in the geyser hot springs in bags. A typical appetizer from the island of Sao Miguel, Azores in Portugal
Boiling Lake close-up, one of two biggest in the world. Perhaps the most famous hike in Dominica, it leads through Valley of desolation up to this spot, where hot sulphur \
Norris Geyser Basin in Yellowstone National Park, Wyoming
norris geyser basin porcelain in in Yellowstone National Park in Wyoming
Mud Volcano and Mud Caldron view in Yellowstone National Park, Wyoming, USA.
Semi-thermal area, geothermal fluid. Mineral hot springs is confined to post-volcanic phase, white ammonium chloride. Thermophilic plants Fimbristulis ochotensis. Kamchatka
Taupo, New Zealand.
Geothermal pool in winter Yellowstone National Park steaming
Mud Volcano in Yellowstone National Park
Boiling water in a geothermal well
Image of Alkaline formations in detail at Yellowstone
Bacterial Mat and Thermal Pool at Norris Geyser Basin in Yellowstone National Park, Wyoming
Geysers
Yellowstone National Park
Close up of water boiling in geyser vent in infrared at Upper Geyser Basin in Yellowstone National Park, Wyoming in winter.
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A corner of Manzanita Lake at Lassen Volcanic National Park in Shasta and Lassen counties, California LCCN2013631202.tif.tiff
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