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abyssal plain

   Also found in: Dictionary/thesaurus, Wikipedia, Hutchinson 0.01 sec.
abyssal plain: see ocean ocean, interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other in most cases by the continental masses. See also oceanography.
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abyssal plain

Flat seafloor area at a depth of 10,000–20,000 ft (3,000–6,000 m), generally adjacent to a continent. The larger plains are hundreds of miles wide and thousands of miles long. The plains are largest and most common in the Atlantic Ocean, less common in the Indian Ocean, and even rarer in the Pacific Ocean, where they occur mainly as small, flat floors of marginal seas or as long, narrow bottoms of trenches. They are thought to be the upper surfaces of land-derived sediment that accumulates in abyssal depressions.


abyssal plain [ə′bisĀ·əl ′plān]
(geology)
A flat, almost level area occupying the deepest parts of many of the ocean basins.


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The recent paper covers two time-series studies- one at "Station M," about 220 kilometers off the Central California coast, and a second on the Porcupine Abyssal Plain, several hundred kilometers southwest of Ireland.
Much of the new understanding has come from two key sites - Station M in the NE Pacific and the Porcupine Abyssal Plain (PAP) in the NE Atlantic, with water depths of around 4100 and 4850 metres, respectively.
Sea creatures conversely have the run of one huge open-plan living space, from the sunlit surface of the Sargasso Sea to the abyssal plains of the Atlantic or the 11,000 metre depths of the Marianas Trench in the Pacific, spanning the planet from the North Pole to the Antarctic coastline.
 
 
 
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