A hydrothermal vent is a hot spring found at depths from three to four thousand meters in areas along mid-ocean ridges. Plate movements occurring on the earth's crust create vents. They cause the surrounding water to increase to high levels of temperature and also release large quantities of hydrogen sulfide in the form of black smoke.

Hydrothermal vents are located in the midnight zone of the ocean. The midnight zone is mostly planes. There is a low concentration of oxygen because of all the pressure. The pressu

Under The Sea, The Nature Company Discoveries Library, PP.32-33

http://www.geneso.edu/~jc99/whatarethey.html

accomplishment. These are all submersibles that can enter the midnight zone. The Cyana, Archimede and DSRV-1 are the only submersibles that have tried to enter the midnight zone.

There are many creatures in the midnight zone. Tripod fish have three stick-like legs, which are used to find remains of dead animals. Limpets are eel-like creatures that have a soft head, which is used for moving around small rocks. Tube worms (pollychaet worms) are truly amazing. They live off the bacteria produced in there own body! This process is known as chemosythesis. Chemosythesis is the process in which a deep-sea dweller lives off its own bacteria. It gathers chemicals from hydrothermal vents and filters out t

Some common words found in the essay are:
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