Cold-water geysers are geysers that have eruptions whose water spurts are propelled by CO2-bubbles, instead of the hot steam which drives the more familiar hot-water geysers: The gush of a cold-water geyser is identical to the spurt from a freshly-opened bottle of soda pop. Cold-water geysers look quite similar to their steam-driven counterparts; however, their CO2-laden water often appears whiter and more frothy.[1]