Old Faithful is a cone geyser in Yellowstone National Park in Wyoming, United States.It was named in 1870 during the Washburn–Langford–Doane Expedition and was the first geyser in the park to be named. [3] [4] It is a highly predictable geothermal feature and has erupted every 44 minutes to two hours since 2000. [5]The geyser and the nearby Old Faithful Inn are part of the Old Faithful ... More @Wikipedia
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