In an attempt to 'organize' the ocean, it has been divided up into several sets of zones. In my opinion, this just complicates things even more, but hey, my opinion doesn't matter.
Light Zones
Sunlit(euphotic) Zone: Top Layer of ocean, photosynthesis occurs here. 90% of ocean life lives here. Approximately down to 600 feet deep.
Twilight(disphotic) Zone: Middle ocean light zone, not possible for photosynthesis to occur, no plants, only animals adapted to life with little light. Approximately from 600 feet to 3000 feet.
Midnight(aphotic) Zone: Deepest ocean zone, no light penetrates here, very high pressures. Approxinately from 3000 feet down
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