Hydrothermal vents are one of the most spectacular features on the seafloor.
They form in places where there is volcanic activity, such as along the Mid-Ocean Ridge. The hot fluid rises to the surface and gushes out of the vent openings. This hydrothermal fluid carries with it dissolved metals and other chemicals from deep beneath the ocean floor. An amazing group of organisms has evolved around hydrothermal vents. They range from tiny bacteria that feed off the chemicals spewing from the vents, to tube worms, giant clams, and ghostly white crabs.