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t. e. The abyssal zone or abyssopelagic zone is a layer of the pelagic zone of the ocean. The word abyss comes from the Greek word ἄβυσσος (ábussos), meaning "bottomless". [1] At depths of 4,000–6,000 m (13,000–20,000 ft), [2] this zone remains in perpetual darkness. [3][4] It covers 83% of the total area of the ocean and 60% of ...
The term benthos, coined by Haeckel in 1891, [3] comes from the Greek noun βένθος 'depth of the sea'. [1][4] Benthos is used in freshwater biology to refer to organisms at the bottom of freshwater bodies of water, such as lakes, rivers, and streams. [5] There is also a redundant synonym, Benton. [6]
The benthic zone is the ecological region at the lowest level of a body of water such as an ocean, lake, or stream, including the sediment surface and some sub-surface layers. The name comes from the Ancient Greek word βένθος (bénthos), meaning "the depths". [1] Organisms living in this zone are called benthos and include microorganisms ...
t. e. The mesopelagiczone (Greek μέσον, middle), also known as the middle pelagic or twilight zone, is the part of the pelagic zone that lies between the photic epipelagic and the aphotic bathypelagic zones. [ 1 ] It is defined by light, and begins at the depth where only 1% of incident light reaches and ends where there is no light; the ...
Demersal fish, also known as groundfish, live and feed on or near the bottom of seas or lakes (the demersal zone). [ 1 ] They occupy the sea floors and lake beds, which usually consist of mud, sand, gravel or rocks. [ 1 ] In coastal waters, they are found on or near the continental shelf, and in deep waters, they are found on or near the ...
The hadal zone, also known as the hadopelagic zone, is the deepest region of the ocean, lying within oceanic trenches. The hadal zone ranges from around 6 to 11 km (3.7 to 6.8 mi; 20,000 to 36,000 ft) below sea level, and exists in long, narrow, topographic V-shaped depressions. [1][2] The cumulative area occupied by the 46 individual hadal ...
Ocean surfaces occupy 72% of the Earth's total surface. They can be divided into surfaces of the relatively shallow and nutrient rich coastal areas above the continental shelves (light blue), and surfaces of the more expansive and relatively deeper but nutrient poor ocean that lies beyond (deep blue). External videos.
A marine habitat is a habitat that supports marine life. Marine life depends in some way on the saltwater that is in the sea (the term marine comes from the Latin mare, meaning sea or ocean). A habitat is an ecological or environmental area inhabited by one or more living species. [1] The marine environment supports many kinds of these habitats.