A geyser is a spring from which water and steam is ejected forcefully into the air at heights ranging from less than a metre to over one hundred metres. Geysers are a quite rare phenomenon on Earth due to the precise conditions that are required for them to form. There are two types of geysers.
Fountain geysers erupt in powerful, often violent bursts from pools of water. While a cone geyser erupts as a steady jet of water from mounds of geyserite (siliceous sinter) and can last just a few seconds through to several minutes. They are mainly clustered near active volcanic areas. Such as The Taupo Volcanic Zone, North Island, New Zealand which is 350 km long by 50 km wide and contains volcanoes, hot springs and geysers.
The largest geyser ever known, the Waimangu Geyser, sat in the Taupo Volcanic Zone. It began erupting in 1900 and erupted periodically until a landslide changed the local water table in 1904. Eruptions often reached 160 m with some super bursts hitting 500 m.