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Lightning strikes above the Fan and Mortar geysers in Yellowstone's Upper Geyser Basin. Geysers are formed when underground water meets superheated rock and blasts back out through a narrow hole.

Giant viruses dating back 1.5 billion years were found in Yellowstone's geothermal springs, which scientists claim could reveal the conditions under which life formed on Earth. The viruses are ...

Catherine Parker Old Faithful may be Yellowstone's most well-known geyser, but the Norris Geyser Basin is home to the park's oldest (thermal features are said to have been present here for more ...

If you want to view Yellowstone's geysers sans crowds, then trek to the Lone Star Geyser. Lone Star Geyser lives up to its name because unlike many other geothermal areas in the park, which are ...

100 Spring Plain in Norris Geyser Basin, Yellowstone National Park. The area is frequently flooded and impassable. (Courtesy of Lauren Harrison) Cinder Pool. Elk Pool. Hydrophane Springs.