![]() ![]() It alone makes up over 83% of the ocean and covers 60% of the Earth. At depths of 3,000 to 6,000 metres, this zone remains in perpetual darkness. The abyssal zone or abyssopelagic zone is a layer of the pelagic zone of the ocean. Although larger by volume than the photic zone, the bathyal zone is less densely populated. The average temperature hovers at about 4 ☌ (39 ☏). It lies between the mesopelagic above, and the abyssopelagic below. The bathyal zone or bathypelagic, also known as midnight zone, is the part of the pelagic zone that extends from a depth of 1,000 to 4,000 m below the ocean surface. 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 depths of this zone are between approximately 200 to 1000 meters below the ocean surface. The mesopelagic zone, 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. Examples of organisms living in this zone are plankton, floating seaweed, jellyfish, tuna, many sharks and dolphins. Consequently, plants and animals are largely concentrated in this zone. Nearly all primary production in the ocean occurs here. ![]() Epipelagic zone is the illuminated zone at the surface of the sea where enough light is available for photosynthesis. The deep sea or deep layer is the lowest layer in the ocean, existing below the thermocline and above the seabed, at a depth of 1800 m or more. ![]()
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