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Grand Prismatic Spring in Yellowstone National Park

Geysers at Midway Geyser Basin Trailhead, Yellowstone National Park.

A vertical shot of the paint pots at Yellowstone.

Yellowstone National Park, Wyoming, United States: the Grand Prismatic Spring, situated in Yellowstone National Park's Midway Geyser Basin, is the largest hot spring in the United States and the third largest globally, spanning approximately 370 feet in diameter and 160 feet in depth while discharging about 560 gallons of 160°F water per minute into the Firehole River via runoff channels. These channels, formed by the spring's outflow, deposit silica minerals as sinter, gradually building terraced formations that preserve ancient microbial mats beneath newer layers. The vibrant rainbow hues—ranging from blue in the sterile central pool to orange, red, yellow, and green in the margins—arise from thermophilic bacteria and algae in the runoff, where temperature gradients influence pigment production: warmer areas favor orange and red carotenoids, while cooler zones promote green chlorophyll. This microbial ecosystem, thriving in extreme heat, offers insights into early Earth life forms.

Mammoth hot springs in Yellowstone National Park, Wyoming, USA

Black sands geyser basin in the Yellowstone National park, USA

Lake of colourful and dangerous poisoned water

Image of Majestic Yellowstone Hot Spring terraces in winter

Mammoth, Hot Spring Terraces, Orange Spring Mound in Yellowstone National Park with beautiful landscape. the smell, the colors, the sounds are a natural experience. USA

Geysers in Yellowstone

Geyser in grand prismatic spring Basin in Yellowstone National Park in Wyoming

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.

a view of the Mammoth Springs Terraces in Yellowstone National Park

Part of Yellowstone's geysers

Mammoth Hot Spring

A wooden boardwalk winds through a grassy geothermal meadow at the base of a pine-covered hillside in Yellowstone National Park. Scattered rocks and bleached logs dot the slope, with young lodgepole pines rising under a vivid blue sky streaked with high clouds.

Thermal pool along a river in Yellowstone National Park, Wyoming, orange bacteria staining the rocks surrounding the pool, bright blue sky, no clouds, early summer.

yellostone national park in August

Yellowstone National Park, Wyoming, USA: Palette Spring, located in the Mammoth Hot Springs area of Yellowstone National Park, is a prominent travertine terrace formed by hot water emerging from the Mammoth thermal system. As the mineral-rich water cools at the surface, it deposits calcium carbonate, creating the spring’s characteristic cascading formations and white to orange coloration. The vivid hues result from thermophilic microorganisms and mineral oxidation. Palette Spring is part of the dynamic hydrothermal network on the northern edge of the Yellowstone Caldera, where constant changes in water flow and temperature reshape the terraces over time.

Large complex of hot springs on a hill. Mammoth hot springs, Yellowstone national park

The world famous Grand Prismatic Spring in Yellowstone National Park, Wyoming, USA. Bright rainbow-colored microbial mats surround the hot spring with steam rising into the air, framed by evergreen forests and a deep blue sky. This breathtaking geothermal wonder is one of the most iconic natural landmarks in America and a top destination for travel, science, and exploration themes.

Spectacular panoramic views of Grand Prismatic Geyser in Yellowstone National Park, Wyoming Montana. Midway Geyser Basin. Great hiking. Summer wonderland to watch wildlife and natural landscape. Geothermal.

Close-up view of bright white and ochre-colored rock formations illuminated by sunlight along the Grand Canyon of Yellowstone. The rugged textures and mineral-rich surfaces stand out sharply against the canyon walls in the background. Below, the Yellowstone River carves through the narrow gorge, visible as a ribbon of turquoise water. The image highlights geological contrast, erosion patterns, and the natural artistry of volcanic stone shaped over millennia. Captured in daylight, emphasizing texture, color, and topographical depth.

Sisters wearing hats hiking on vacation in the mountains.

Old Faithful and Mammoth Hot Springs thermal features

Image of Winter in Yellowstone brings snowy terraces at hot springs

Wyoming, United States: colorful runoff channels of the Excelsior Geyser Crater in Yellowstone National Park’s Midway Geyser Basin. The vivid orange, yellow, and brown hues result from thermophilic bacteria and archaea that colonize the mineral-rich outflow, thriving at varying temperatures along the thermal gradient. Silica and other minerals precipitate from the hot water, creating layered terraces that reflect both chemical deposition and microbial activity. This interplay of geothermal heat, minerals, and microorganisms produces one of Yellowstone’s most striking hydrothermal landscapes.

Minerva Terrace in Mammoth Hot Springs

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