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Geysers at Midway Geyser Basin Trailhead, Yellowstone National Park.
Geothermal area
Image of Steam covers iconic Grand Prismatic Spring in Yellowstone winter
Norris Geyser Basin in Yellowstone National Park which is the hotest geyser basin in the park.  Porcelain Basin with hot springs, thermal algae; steam and various colors. Bacterial thermophiles.
Boiling Hot Springs with Steam in Yellowstone National Park Background Landscape Nature Water
Steaming Geysers and thermal pools at Yellowstone National Park
Grand Prismatic Spring Overlook in Yellowstone National Park, Wyoming, USA.
TLocated in the Midway Geyser Basin in Yellowstone National Park, Excelsior Geyser drains 4,000-4,500 gallons of water per minute into the Firehole River.
Path around Grand Prismatic Geyser in Midway Geyser Basin. Yellowstone, USA
Biscuit Basin is a geothermal area named for the biscuit-like silica formations that once surrounded its most famous feature, Sapphire Pool. After an eruption in 1959, many of the biscuit formations at Sapphire Pool were destroyed. It's a relatively small geothermal area compared to others in the park. The entire basin can be explored via a boardwalk loop that is approximately 0.7 miles (1.1km) long.
Closeup of Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park, Wyoming, USA
Turquoise Water of Excelsior Geyser Full Of Steam In Yosemite National Park
Geysers and Hot Springs at Yellowstone
Textures and colors of the terrain in Yellowstone National Park XXI, USA
A beautiful view of a valley in Yellowstone at sunset, steam blowing across the landscape from volcanic pools and vents.  Three bison are barely visible in the background resting in the evening light.
Image of Stunning sulfuric and alkaline pools in Yellowstone
Yellowstone Lake and Thumb Geyser view in Yellowstone National Park, Wyoming, USA.
Detail of one of the hot springs that are located at Yellowstone National Park.
King Geyser at West Thumb Geyser Basin in Yellowstone National Park, Wyoming
The aquamarine colors of this Yellowstone hot spring are reflections of bacteria that thrive in the hottest waters of the park.
A geyser in Wyoming Yellowstone national park
Scenery at Upper Geyser Basin, Yellowstone National Park, Wyoming, USA
Geothermal pool in winter Yellowstone National Park steaming
freedom girl jumping at yellowstone state park
Grand Prismatic Spring Overlook in Yellowstone National Park, Wyoming, USA.
Image of Detail of colorful Yellowstone pools of acidic sulfur
Excelsior Geyser in the Midway Geyser Basin next to the Firehole River in Yellowstone National Park in Wyoming USA
Norris Geyser Basin in Yellowstone National Park at Park County, Wyoming. This is on the Porcelain Basin trail. Norris Geyser Basin spans about 12 square miles, it is the park's oldest geyser basin, with geothermal activity dating back over 115,000 years. Norris is named for Philetus W Norris, the second superintendent of Yellowstone and first to describe these thermal features.
Active geysers erupting in the morning, Yellowstone National Park, USA
Steam rising from thermal hot springs and geysers in Yellowstone National Park, Wyoming, USA.
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