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Underwater geysers, also known as hydrothermal vents, are fissures on the ocean floor that release geothermally heated water. They are formed when seawater seeps into the Earth's crust, gets heated by magma, and then rises back to the surface due to pressure differences. These vents create unique ecosystems that support organisms such as giant tube worms, clams, and shrimp that thrive in the extreme conditions of high temperature, pressure, and toxic chemicals. The water around underwater geysers can reach temperatures up to 750°F (398°C) and is rich in minerals, which provide a source of energy for these organisms. Underwater geysers are found near volcanically active areas, such as mid-ocean ridges, and play an important role in the global carbon cycle by releasing carbon dioxide into the ocean.