Though it is difficult to generalize for the ocean as a whole, the bottom of the euphotic zone is about deep in mid-latitudes.
A) 10 meters (33 feet)
B) 70 meters (230 feet)
C) 160 meters (525 feet)
D) 500 meters (1,640 feet)

Question

Quizplus · Accepted Answer

The euphotic zone, where sunlight penetrates enough for photosynthesis, typically extends to about 70 meters in mid-latitudes.

Though It Is Difficult to Generalize for the Ocean as a Whole