Answer
Geysers erupt due to a combination of factors involving geothermal heat and the physical properties of the geyser's plumbing system. The eruption process begins when water in the geyser's underground reservoir is heated to the boiling point by geothermal heat. As the water reaches the boiling point, steam bubbles start to form and rise. These bubbles reduce the pressure in the system, causing the water to boil more vigorously.
The intense boiling creates a high-pressure steam cap that prevents the water from boiling and erupting immediately. Eventually, the pressure builds up enough to overcome the resistance of the steam cap, leading to a sudden release of pressure and a powerful eruption of hot water and steam from the geyser's vent. The process then repeats, resulting in periodic eruptions.
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