areas above the continental shelf drop-off (often around 200m) (8, 4)
circulation consisting of a series of shallow, slow, counter-rotating vortices at the ocean's surface aligned with the wind. These circulations are developed when wind blows steadily over the sea surface. (8, 8)
depth where no photosynthesis occurs (8, 5)
depth where rate of photosynthesis matches rate of respiration (lower boundary of euphoric zone) (12, 5)
energy transferred between trophic levels (10, 10)
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