Old Faithful is a cone geyser located in Wyoming, in Yellowstone National Park in the United States. Old Faithful was named in 1870 during the Washburn-Langford-Doane Expedition and was the first geyser in the park to receive a name. It is also called the most predictable geographical feature on Earth erupting almost every 91 minutes.
Eruptions can shoot 3,700 to 8,400 US gallons (14,000 to 32,000 L) of boiling water to a height of 106 to 185 feet (32 to 56 m) lasting from 1.5 to 5 minutes. The average height of an eruption is 145 feet (44 m).[7] The highest recorded eruption was 185 feet (56 m). Intervals between eruptions can range from 45 to 125 minutes, averaging 66.5 minutes in 1939,[8] slowly increasing to an average of 90 minutes apart today.The time between eruptions has a bimodal distribution.

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