On average, the illuminated zone in oceans is to a depth of ________, but in some oceans may be as deep as ________

A) 100 m (330 ft); 500 m (1,640 ft) B) 60 m (200 ft); 300 m (1,000 ft)
C) 30 m (100 ft); 900 m (3,000 ft) D) 20 m (66 ft); 30 m (100 ft)


B

Environmental & Atmospheric Sciences

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