abyssal plain

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Related to Abyssal plane: abyssal floor

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.