A typical geyser expels hot water and steam when an underground spring comes in contact with hot rocks heated by magma, causing the water to boil. The resulting expansion of the super heated water causes hot water and steam to spray out of the geyser’s surface vent resulting in the geyser effect. But not all geysers are driven by steam. Some of them are propelled by carbon-dioxide gas. The water of these geysers are cold, and they are called cold water geysers.
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A cold water geyser erupts above treetops in Andernach, Germany. Photo credit: Holger Weinandt/Wikimedia Commons
Source: amusingplanet.com