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Morning Glory pool at Yellowstone National Park, Wyoming, USA.

Grand Prismatic Spring in Yellowstone National Park

Located in Yellowstone National Park, Wyoming, the largest hot spring in the United States and third larges in the world. The amazing colors are actually the heat loving microbes in the pools.

Geysers at Midway Geyser Basin Trailhead, Yellowstone National Park.

Yellowstone National Park, Wyoming, USA

Grand Prismatic Springs in Yellowstone

Path around Grand Prismatic Geyser in Midway Geyser Basin. Yellowstone, USA

Upper Geyser Basin in Yellowstone

Serene Mountain Range View with Trees in Yellowstone National Park Background Landscape Nature Valley Blue

Yellowstone National Park, Wyoming, USA: Old Faithful is a cone geyser located in Yellowstone National Park, Wyoming, renowned for its relatively predictable eruption pattern that occurs approximately every 90 minutes, though intervals can range from 60 to 110 minutes depending on the duration of the previous eruption. The geyser shoots a column of boiling water to heights averaging 130-140 feet (40-43 meters), with eruptions lasting between 1.5 to 5 minutes and expelling 3,700 to 8,400 gallons (14,000 to 32,000 liters) of water. Named during the 1870 Washburn Expedition for its consistent activity, Old Faithful is powered by underground thermal features where superheated water under pressure periodically flashes to steam, creating the eruption cycle. As one of more than 500 geysers in Yellowstone—which contains over half of the world's geysers—Old Faithful has been erupting in its current pattern for hundreds of years, making it one of the park's most studied and visited thermal features, with its activity carefully monitored and predicted by the National Park Service based on the duration and strength of each eruption.

Located in Yellowstone National Park, Wyoming, the largest hot spring in the United States and third largest in the world. The amazing colors are actually varying species of heat loving microbes in the pools - each having a different color and existing at a different temperature.

Beautiful abstract view of Sapphire Pool in Yellowstone National Park

Closeup of Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA

Yellowstone Rainbow Pool in Winter

Lower Falls at Grand Canyon of the Yellowstone

Flowing pattern and geyser, Yellowstone National Park, USA.

West Thumb Geyser Basin in Yellowstone National Park in Wyoming, USA: The Majestic Hot Springs formed by a large volcanic explosion 150,000 years ago

The iconic Grand Prismatic Spring vibrant center is teeming with thermophilic microbes, while the cooler peripheral zones host algae and other organisms

Nighttime at Yellowstone Grand Prismatic Spring with stormy clouds in the background

Boiling Hot Springs with Steam in Yellowstone National Park Background Landscape Nature Water

A small geyser near the river at the national park.

Old Faithful Geyser is one of the most famous geysers in the world, known for its regular eruptions. It was named in 1870 for its reliability in spewing hot water and steam at intervals of 60 to 110 minutes, reaching heights of 100 to 180 feet. Each eruption lasts about 1.5 to 5 minutes, discharging up to 8,400 gallons of water. Old Faithful is fueled by geothermal activity from the Yellowstone Caldera, a supervolcano, and has erupted more than a million times since the park's founding.

Yellowstone National Park, unique landscapes, geothermal features, Old Faithful Geyser, Yellowstone Lake, Grand Canyon of the Yellowstone, hot springs, mud pots, sulfur springs, mineral deposits, wildlife, bison, elk, bear, wolf, forest, river, waterfall, volcanic activity, natural wonder

Firehole Spring on the Firehole Lake Drive in Lower Geyser Basin at Yellowstone National Park, Wyoming.

Grand Prismatic Spring in Yellowstone National Park, the largest hot spring in the United States: The beautiful abstract Midway Geyser Basin with rainbow prism colors

Yellowstone National Park turquoise thermal pool, Wyoming, USA.

Image of Steam covers iconic Grand Prismatic Spring in Yellowstone winter

Firehole River at dawn in Yellowstone National Park

Hot spring in Yellowstone National Park in summer with blue sky

Yellowstone National Park, Wyoming, USA: the travertine pools of Palette Spring in Mammoth Hot Springs, Yellowstone National Park, are formed by hot, calcium-rich water emerging from underground sources. As the water cools and releases carbon dioxide at the surface, calcium carbonate precipitates, building terraces and rimstone pools. These pools display striking colors—white, yellow, and orange—caused by thermophilic microorganisms and mineral deposits. Constant fluctuations in water flow, temperature, and chemistry reshape the formations over time.

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