abyssal floor
abyssal plain

Dictionary of ichthyology. 2009.

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  • abyssal hill — ▪ geology       small, topographically well defined submarine hill that may rise from several metres to several hundred metres above the abyssal seafloor, in water 3,000 to 6,000 m (10,000 to 20,000 feet) deep. Typical hills have diameters of… …   Universalium

  • abyssal — abysmal, abyssal The currency of these two words is in inverse proportion to that of the parent words: abysmal, with its figurative meaning ‘very bad’ and a literal meaning relating to gorges, outer space, etc., is common, whereas abyssal is… …   Modern English usage

  • 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

  • Abyssal plain — Abyssal plains are flat or very gently sloping areas of the deep ocean basin floor. They are among the Earth s flattest and smoothest regions and the least explored. Abyssal plains cover approximately 40% of the ocean floor and reach depths… …   Wikipedia

  • Abyssal zone — Abyssal redirects here. For the Envy album, see Abyssal (album). Aquatic layers Pelagic    Photic      …   Wikipedia

  • Abyssal channel — Abyssal channels are channels in Earth s sea floor. They are formed by fast flowing floods of turbid water caused by avalanches near the channel s head, with the sediment carried by the water causing a a build up of the surrounding abyssal plains …   Wikipedia

  • abyssal zone — n. the ecological zone along the deep ocean floor between the bathyal and hadal zones …   English World dictionary

  • abyssal plain — noun : any of the great flat sediment covered areas of ocean floor * * * abyssal plain, a deep, extremely level undersea plain, such as the plain lying about 750 miles to 1,000 miles off the eastern coast of North America, with deposits of clay,… …   Useful english dictionary

  • abyssal plain —   large, relatively flat areas of ocean floor found at 5,000 6,000m below sea level. If sediments are discharged from a river and deposit relatively quickly onto the plain they may form an abyssal fan …   Geography glossary

  • abyssal zone — noun the deep sea (2000 meters or more) where there is no light • Hypernyms: ↑ocean floor, ↑sea floor, ↑ocean bottom, ↑seabed, ↑sea bottom, ↑Davy Jones s locker, ↑Davy Jones * * * noun …   Useful english dictionary

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