Geyser
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 Geyser facts

• The formation of geysers is due to particular hydrogeological conditions, which exist in only a few places on Earth, so they are a fairly rare phenomenon
• Generally all geyser field sites are located near active volcanic areas, and the geyser effect is due to the proximity of magma
• Generally, surface water works its way down to an average depth of around 2,000 metres (6,600 ft) where it contacts hot rocks
• The resultant boiling of the pressurized water results in the geyser effect of hot water and steam spraying out of the geyser's surface vent (a hydrothermal explosion)
• Over one thousand known geysers exist worldwide
• At least 1,283 geysers have erupted in Yellowstone National Park, Wyoming, United States, and an average of 465 geysers are active there in a given year
• A geyser's eruptive activity may change or cease due to ongoing mineral deposition within the geyser plumbing, exchange of functions with nearby hot springs, earthquake influences, and human intervention
• Jet-like eruptions, often referred to as cryogeysers, have been observed on several of the moons of the outer solar system
• Due to the low ambient pressures, these eruptions consist of vapor without liquid; they are made more easily visible by particles of dust and ice carried aloft by the gas
• Water vapor jets have been observed near the south pole of Saturn's moon Enceladus, while nitrogen eruptions have been observed on Neptune's moon Triton