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© Digital Vision/Getty Images Old Faithful is an example of a cone geyser. Cone geysers are visible on Earth’s surface as mounds of porous deposits of siliceous sinter (geyserite). Cone geysers typically produce steady eruptions lasting several seconds or minutes. The duration of Old Faithful’s eruptions ranges from 1.5 to 5.5 minutes. Billowing steam and 3,700 to 8,400 gallons (14,000 to 32,000 litres) of hot water are ejected at each eruption. The geyser’s fountainlike columns reach heights averaging about 130–140 feet (40–43 metres), although eruption height can exceed 180 feet (55 metres). During an eruption, the water temperature at the geyser’s opening is about 203–204 °F (95–95.6 °C).

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