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The abyssal zone or abyssopelagic zone is a layer of the pelagic zone of the ocean. The word abyss comes from the Greek word , meaning "bottomless". At depths of 4000 - 6000 m, this zone remains in perpetual darkness. It extends across 83% of the total area of the ocean and 60% of Earth's surface. The abyssal zone has temperatures around 2 - 3 C through the large majority of its mass. The water pressure

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