Clepsydra Geyser (1991)

Clepsydra Geyser, in the Lower Geyser Basin of Yellowstone National Park, Wyoming. It squirts continuously with a spray that can reach 14 meters. Some of the basin’s other geysers are in the background.

A clepsydra (Greek for “water thief”) was an ancient water clock that worked like an hourglass for timing events. When it was named, Clepsydra Geyser erupted every three minutes. A 1959 earthquake deranged the clockwork.

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