What are the habitats of deep sea vents?

Answer 1

Geothermal heat often finds it way to the surface of the Earth, and most often beneath the ocean as there isn't a lot of continental land mass in its way out. When this heat reaches the ocean floor its produces a flurry of chemical reactions with the mud there. This mud is the collected debris of dead algae and other oceanic life that has rained down from above. Now the temperature of the water at ocean floor is 3'C, water colder than that becomes less dense and floats upwards. So the presence of geothermal heat is a Great increase in available energy. All this considered together gives a good habitat for life. The collected nutrients laying dormant there are suddenly made available. Bacteria and other microorganisms capable of using heat for synthetic activities (kinosynthetic) provide a food source for any other lifeforms that is down there: crustaceans tube worms, fish, etc etc etc.