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Definition of Abyssal plain.

Abyssal plain. Definition from Science & Technology Dictionaries & Glossaries
Glossary of Marine Biology
The deep ocean floor, an expanse of low relief at depths of 4,000 to 6,000 m
The flat, gently sloping or nearly level region of the sea floor.
Fishery Glossary
An extensive, flat, gently sloping or nearly level region at abyssal depths. IHO/IOC (1985)
Abyssal plain. Definition from Encyclopedia Dictionaries & Glossaries
English Wikipedia - The Free Encyclopedia
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3000 and 6000 m. Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface. They are among the flattest, smoothest and least explored regions on Earth. Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills). In addition to these elements, active oceanic basins (those that are associated with a moving plate tectonic boundary) also typically include an oceanic trench and a subduction zone.

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