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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
Blue Copper Sulfate Yellow Bushes Arches National Park Moab Utah USA Southwest Copper sulfate used to produce copper and other products
Teide's National Park, Volcanic Bombs embeded in Lapilli slopes.  Multicolors Volcanic Rocks. Tenerife, Canary IslandsDescurainia 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
Steam vent at the Sulphur Works - Lassen Volcanic National Park
Painted Dunes at  Lassen Volcanic National Park, viewed from Cinder Cone, on a smoky and hazy day  with poor visibility
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.
Hverir geothermal area in Iceland
Sediment layers in El Teide National Park Tenerife, Spain,Nikon D850
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
The colors of the rocks are striking and due in part to varying minerals in the waters of the area.
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.
Krafla lava fields are volcanic fissure zone, mixite of old and new lava field.
Lower Geyser Basin, Yellowstone National Park, Wyoming USA: fumaroles in the Lower Geyser Basin of Yellowstone National Park are the hottest hydrothermal features, characterized by vents emitting steam and gases such as carbon dioxide and hydrogen sulfide, where limited groundwater boils away upon contact with hot rocks before reaching the surface, often producing a loud hissing sound and temperatures up to 280°F (138°C). These features are driven by superheated brine deep below the fractured volcanic rocks and are prominently viewable in areas like the Fountain Paint Pot Trail.
View of the Sulphur Works hydrothermal area in Lassen Volcanic National Park, California, USA.
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.
The solfataras and fumaroles fields Namaskard
Mud pots erupting at the Fountain Paint Pots in Yellowstone National Park in Wyoming
A slender vein of rust-orange hydrothermal runoff snakes through pale, knobby sinter and scattered rocks in Yellowstone. Mineral deposits and heat-loving microbes tint the trickle vivid orange against the gray crust, with tiny bubbles and wet sparkle catching the sun.
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