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euphotic zone

[ yoo-foh-tik ]
/ yuˈfoʊ tɪk /
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noun Oceanography.
the layer of sea water that receives enough sunlight for photosynthesis to occur: it varies greatly with season and latitude, from 0 to 1200 ft. (0–360 m).
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QUIZ YOURSELF ON "WAS" VS. "WERE"!
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

Origin of euphotic zone

First recorded in 1960–65; eu- + photic
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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