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Which of the following are TRUE of thermohaline circulation? Use the diagram below to help.

I. Surface currents are warmer than deep currents.
II. Deep water formation happens because cold water is denser than warm water.
III. Deep water formation happens because the water becomes saltier as sea ice forms.
IV. Surface currents near the equator become cooler than those near the poles.

"Thermohaline Circulation." Wikipedia. Wikimedia Foundation, n.d. Web. 29 May 2016.


I only.


II and III.


I, II, and III.


II and IV.


I, II, III, and IV.

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