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Old Faithful Geyser is a renowned natural feature located in Yellowstone National Park, a national park in the United States. It is famous for its predictable and regular eruptions, which occur approximately every 60 to 110 minutes, making it one of the most reliable geothermal features on Earth. The geyser was named by members of the Washburn-Langford-Doane Expedition in 1870 due to its consistent behavior. Old Faithful Geyser is a cone geyser, which means that it erupts from a narrow opening in the ground, sending a plume of steam and boiling water up to heights ranging from 106 to 185 feet. The water temperature at the vent can reach up to 204°F (95.6°C), while the steam temperature is around 350°F (176.7°C). The geyser's eruption cycle begins with a period of bubbling and hissing, as underground water heats up and creates pressure within the geyser's plumbing system. This leads to the ejection of steam and boiling water, followed by a quiet phase where the geyser refills with water for the next eruption. Old Faithful Geyser holds historical significance as one of the first natural landmarks in Yellowstone National Park to gain widespread recognition. Its predictable eruptions have captivated visitors since the park's establishment, drawing scientists and tourists alike to witness this unique geothermal phenomenon. Over time, the geyser has become a symbol for the wonders of America's national parks and the preservation of natural resources. In summary, Old Faithful Geyser is an iconic and reliable geothermal feature within Yellowstone National Park, representing a captivating historical landmark that embodies the splendor of the country's national park system.