Chicago, illinois―Steamboat Geyser, in the heart of Yellowstone National Park, usually shoots fountains of water 5 to 10 meters high. But at irregular intervals of years to decades, the geyser unleashes a scalding 100-meter column, followed by a deafening roar of steam for a day or more. A mysterious trigger far underground expels the deepest, hottest water from the geyser's hydro-thermal system in a crowd-pleasing burst.
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