Deep-Water Circulation Brings Dense, Cold, Oxygen-Rich Water from the Surface

question 52

Multiple Choice

Deep-water circulation brings dense, cold, oxygen-rich water from the surface to the deep ocean because of:

• A)greater rates of photosynthesis in deep water.
• B)greater dissolution of oxygen in colder water than warmer water.
• C)increases in pH with depth.
• D)decreases in pH with depth.
• E)greater volcanic out-gassing at the ocean surface.

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