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Hot spring cyanobacteria are wonders of life at high
temperatures. Some live in water as hot as 167
ºF (75 ºC). At this temperature they are
usually yellow, but become darker- orange, rust, or
brown- as the water cools. Photograph by David E.
Wieprecht, September 1998.
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Castle Geyser in the Upper Geyser Basin, a particularly good
example of a "cone-type" geyser with a prominent cone
of siliceous sinter enclosing the geyser vent. Photograph by S.R. Brantley on 23 May 2001.
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Steamboat, located in Norris Geyser Basin, is one of Yellowstone's most famous geysers. Eruptions occur sporadically, but are well worth the wait. Columns of hot water reach heights up to 100 meters. This is followed by a raucus steam phase that can last for over a day, loudly discharging steam nearly 200 meters into the atmosphere. This photograph shows a vertical view of the 2 May 2000 eruption. Photograph courtesy of Tom Cawley, NPS.
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This photograph shows a horizontal view of the 2 May 2000 eruption of Steamboat Geyser. Photograph courtesy of Tom Cawley, NPS.
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