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In the ocean (or in lakes) this is the area near the
surface with enough light to support photosynthesis. In this zone, both the
chemical and biological activity can be enhanced by penetrating solar radiation.
This zone is about 20 meters in depth in the ocean. In the upper surface of this
zone, the marine photochemistry is most vigorous. Changes in the ultraviolet
light content penetrating this region because of changes in the UV-blocking
ability of the ozone layer may create unexpected biological results there.
[Atmospheric Change; T. E. Graedel and Paul J. Crutzen; Page 179; 1993; W. H.
Freeman and Company; New York.] [Climate; M.R.Rampino et; Page 334; 1987; Van
Nostrand Reinhold Company Inc; New York.]
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