hadal depth

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• Hadal zone — or (trench zone) (Greek for like Hades, in other words unseen ) or Hadopelagic zone is the delineation for the deepest trenches in the ocean. This zone is found from a depth of around m to ft|6000|precision= 3 to the bottom of the ocean.… …   Wikipedia

• abyssal zone — n. the ecological zone along the deep ocean floor between the bathyal and hadal zones * * * ▪ geology       portion of the ocean deeper than about 2,000 m (6,600 feet) and shallower than about 6,000 m (20,000 feet). The zone is defined mainly by… …   Universalium

• Deep sea communities — giant tubeworm Deep sea communities currently remain largely unexplored, due the technological and logististical challenges and expense involved in visiting these remote biomes. Because of the unique challenges (particularly the high barometric… …   Wikipedia

• Benthic zone — The benthic zone is the ecological region at the lowest level of a body of water such as an ocean or a lake, including the sediment surface and some sub surface layers. Organisms living in this zone are called benthos. They generally live in… …   Wikipedia

• Pelagic zone — Aquatic layers Pelagic    Photic       Epipelagic …   Wikipedia

• Ocean — For other uses, see Ocean (disambiguation). Maps exhibiting the world s oceanic waters. A continuou …   Wikipedia

• Demersal fish — Bluespotted ribbontail ray resting on the seafloor Demersal fish live on or near the bottom of the sea or lakes.[1] They occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks …   Wikipedia

• marine ecosystem — Introduction       complex of living organisms in the ocean environment.       Marine waters cover two thirds of the surface of the Earth. In some places the ocean is deeper than Mount Everest is high; for example, the Mariana Trench and the… …   Universalium

• ocean — I (New American Roget s College Thesaurus) n. sea (see water). II (Roget s IV) n. Syn. sea, Great sea, high seas, salt water, seashore, seaside, beach, shores, Oceanus, Neptune, the mighty deep, the main, the Great waters, the Seven Seas, mare,… …   English dictionary for students

• Hydrothermal vent — Marine habitats White smokers emitting liquid carbon dioxide at the Champagne vent, Northwest Eifuku volcano, Marianas Trench Marine National Monument Littoral zone …   Wikipedia

• Deep sea creature — A. cornuta The term deep sea creature refers to organisms that live below the photic zone of the ocean. These creatures must survive in extremely harsh conditions, such as hundreds of atmospheres of pressure, small amounts of oxygen, very little… …   Wikipedia