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.
A cold water geyser erupts above treetops in Andernach, Germany.
Cold water geysers are very rare.
There are only a handful of such examples on the planet.
The geyser was finally reactivated in 2006 as a tourist attraction.
Andernach Geyser typically erupts every two hours, for six to eight minutes at a time.
Since then the geyser has been periodically erupting while expelling large quantities of carbon dioxide and travertine-depositing water.
It erupts every 8 to 22 hours sometimes as long as 30 minutes.
It erupts periodically very 24 to 32 hours and erupts water to the height of 1015 meters.
Each eruption lasts around 25 minutes.
The eruptions of the Wallender Born occur roughly every 35 minutes, with each eruption lasting about 5 minutes.
Unlike other cold geysers, the eruption is less like a fountain and more turbulent.
The maximum height of the water column is only about 4 meters.
Photo credit:Kreuzschnabel/Wikimedia Commons
Photo credit:1971markus/Wikimedia Commons
