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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.
Painted Dunes at Cinder Cone Crater \nLassen Volcanic National Park
Smoking fumaroles of Bumpass Hell, Lassen Volcanic park, California. Visible yellow sulfur cristals.
Rock sediment in Lassen National Park, near the Sulphur Works area. California, USA
Lassen National Park - California
California’s Lassen Peak, having last erupted in 1914, is one of the more recent eruptions in the country. Today it is dormant but there is still much geothermal activity in the area. Sulphur vents, mud pots and boiling springs prove that the earth is not asleep. This geothermal mound was photographed at Sulphur Works in Lassen Volcanic National Park, California, USA.
Bumpass Hell, Lassen volcano national park. Hydrothermal area with a trail past mud pots, fumaroles, boiling springs, and mountain views
Teide's National Park, Volcanic Bombs embeded in Lapilli slopes.  Multicolors Volcanic Rocks. Tenerife, Canary Islands\n\nDescurainia bourgaeana plants
The Mono–Inyo Craters are a volcanic chain of craters, domes and lava flows in Mono County, Eastern California. Angle of repose with rhyolite rock and obsidian. Mono Basin, California.
Lassen Volcanic National Park landscape with steaming fumaroles and trees.\n\n
Boiling, muddy pools of water
Blue Copper Sulfate Yellow Bushes Arches National Park Moab Utah USA Southwest Copper sulfate used to produce copper and other products
A sulfurous fumarole in the Solfatara in Pozzuoli near Naples. A fumarole is an opening in the crust of the earth emitting gases or steam.
Painted Dunes at  Lassen Volcanic National Park, viewed from Cinder Cone, on a smoky and hazy day  with poor visibility
Hverir geothermal area in Iceland
Wide view of a chalk-white mudpot crater in Yellowstone as a lumpy clay chunk pops into the air above a bubbling, viscous surface. Layered mineral rims and crusted textures ring the basin under bright midday sun.
Painted Dunes by Cinder Cone, Lassen Volcanic National Park, California. Also called the Fantastic Lava Beds.
Close up of a bubbling mud pot in the Sulphur Works area of Lassen Volcanic National Park, a geothermal feature
Sediment layers in El Teide National Park Tenerife, Spain,Nikon D850
The colors of the rocks are striking and due in part to varying minerals in the waters of the area.
Krafla lava fields are volcanic fissure zone, mixite of old and new lava field.
View of the Sulphur Works hydrothermal area in Lassen Volcanic National Park, California, USA.
Lower Geyser Basin, Yellowstone National Park, Wyoming USA: the mud pots at the Fountain Paint Pot area in Yellowstone National Park’s Lower Geyser Basin are acidic geothermal features formed where limited water supply and intense heat interact with volcanic gases and minerals. Hydrogen sulfide gas from underground vents is converted by microorganisms into sulfuric acid, which dissolves surrounding rock into fine clay, creating a viscous, bubbling mud. The texture and activity of the mud pots vary seasonally, becoming more fluid during spring runoff and thicker in late summer. Their distinctive colors—ranging from pink and red to gray and brown—are produced by varying iron oxide and mineral content in the clay.
Mud pots erupting at the Fountain Paint Pots in Yellowstone National Park in Wyoming
Chaos Crags is the youngest group of lava domes in Lassen Volcanic National Park, California. They formed as six dacite domes 1,100-1,000 years ago. Cascade Mountain Range. A rock avalanche.
The solfataras and fumaroles fields Namaskard
Mud volcano at the Sulphur works area in Lassen Voclanic National Park, Northern California
Less known National Park with a lot of Volcanic activity in California.
Steam vent at the Sulphur Works - Lassen Volcanic National Park
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