Marine vents are found in what is called the Mid-Ocean Ridge. They are vents that look like chimneys that spew out hydrogen-sulfide. The animals that live there are muscles, crabs, tube worms, eel pout, and sea snails. Tube worms are worms that stick out of their tubes and eat hydrogen-sulfide. They live at the bottom of the sea next to marine vents. They lay eggs but do not take care of their young. We found out about them from the submersible Alvin. Marine vents are formed in the Mid-Ocean Ridge. They provide the sea with hydrogen-sulfide.