Discussion
The thermohaline circulation is driven by
Answer: D
Correct answer: density differences of temperature and salt
The thermohaline circulation is driven by density: cooling and salt rejection during sea ice formation at high latitudes make surface water dense enough to sink, and that sinking drives a slow global overturning with a timescale of a thousand years or so. Wind, tides and Coriolis all act on it, but density contrast is what sets it in motion.
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