abyssal plain


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Related to abyssal plain: Continental Rise

abyssal plain:

see oceanocean,
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

[ə′bis·əl ′plān]
(geology)
A flat, almost level area occupying the deepest parts of many of the ocean basins.
References in periodicals archive ?
Scientists know little about the benthic (deep-sea) species residing in the abyssal plains, but what they're learning shows them to be highly adapted to an extreme environment, where temperatures hover just above freezing and pressures become crushing.
The Sohm Abyssal Plain generally has a thick sediment cover; compilations of sediment thickness estimate that the thickness is over 2 km in the area beyond 200 nm (GSC 1994).
Plunging into the ocean off the west coast of Vancouver Island, the more than 800 kilometers of fiber optic cables that connect the research stations stretch across the continental shelf, plummet down the slope and across an abyssal plain, and skirt hydrothermal vents near a mid-ocean ridge where the Earth gives birth to new ocean crust.
Rare, very large turbidity currents periodically deposit thick sequences of sediment on oceanic abyssal plains, but their return periods span many thousands of years.
ODP has just commenced a systematic approach to drilling in passive margins in the North Atlantic with Leg 149 (March to May 1993), which included a transect across part of the Iberia Abyssal Plain (IAP) west of Portugal.
Within that area lie the Campeche Knolls, 22 elongated hills that stand anywhere from 450 meters to 800 m above the surrounding abyssal plain.
Robert Fisher notes that scientists found minerals covering the ocean's abyssal plain during the early days of deep-ocean research.
To see how well the plan might work, Sarah Colley and John Thomson of the Institute for Oceanographic Sciences in Godalming, England, studied a 30-meter-long sediment core from an abyssal plain in the northeast Atlantic Ocean.
The Blake Plateau basin is located on the southern margin of a large structural terrace that is situated between the shelf margin and Atlantic abyssal plain.
At 3,000 metres lies the abyssal plain, which covers more than half the Earth's surface.
Down at 3000 metres, the abyssal plain covers over half the Earth's surface.
Racal says 70% of the route is across a featureless abyssal plain.