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Lassen Volcanic National Park landscape with steaming fumaroles and trees.\n\n
Painted Dunes at Cinder Cone Crater \nLassen Volcanic National Park
Smoking fumaroles of Bumpass Hell, Lassen Volcanic park, California. Visible yellow sulfur cristals.
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.
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 IslandsDescurainia bourgaeana plants
Blue Copper Sulfate Yellow Bushes Arches National Park Moab Utah USA Southwest Copper sulfate used to produce copper and other products
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.
Boiling, muddy pools of water
Steam vent at the Sulphur Works - Lassen Volcanic National Park
Ebeko Volcano, Paramushir Island, Kuril Islands, Russia
Chaos Crags and Chaos Jumbles at Lassen National Park
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.
View of the Sulphur Works hydrothermal area in Lassen Volcanic National Park, California, USA.
Painted Dunes by Cinder Cone, Lassen Volcanic National Park, California. Also called the Fantastic Lava Beds.
Painted Dunes at  Lassen Volcanic National Park, viewed from Cinder Cone, on a smoky and hazy day  with poor visibility
Close up of a bubbling mud pot in the Sulphur Works area of Lassen Volcanic National Park, a geothermal feature
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.
The colors of the rocks are striking and due in part to varying minerals in the waters of the area.
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.
This area is known for its bubbling mud pots, fumaroles, and acidic hot springs. Grizzly Fumarole emits steam and gases, including hydrogen sulfide, which gives the area its characteristic sulfuric smell. Its location near Mud Volcano highlights the region's geothermal activity, driven by the heat from the Yellowstone supervolcano beneath. The fumarole's occasional rumbling sound resembles a grizzly bear’s growl, which is how it got its name.
Slot Canyon featuring Cone shaped Tent Rocks -Multicolored rocks shaped like traditional native American tents. Kasha-Katuwe Tent Rocks National Monument in New Mexico, SW USA. Cochiti Pueblo New Mexico. the cone shaped tent rock formations are the products of volcanic eruptions.
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.
Steam rises from geothermal ground along Sulphur Works trail in Lassen Volcanic National Park California
Detailed view of a geothermal surface in Yellowstone National Park showing mineral deposits and flowing patterns caused by thermal water activity. The image, taken in October 2024, highlights the vivid colors and textures created by natural geothermal processes.
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