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The three ocean light zones are known as the "photic" zones. The Greek root photic means light.

§ The Euphotic Zone:

extends from 0m to 80m

means "full of light". In this light zone

enough light penetration for green plant growth.

§ The Disphotic Zone:

extending from 80m to approximately 200m

means "partial light"

Variety of blue-green light here.

§ The Aphotic Zone:

extending beyond the 200m mark

means "without light"

any life in this region must survive without light.

In other curtailed words - the sunlight zone, The Twilight Zone and the midnight zone.

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