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1.What causes surface currents?
A. wind forces
B. high salinity
C. differences in density
D. differences in water temperature

2.Temperature and salinity both influence the movement of water in deep-water currents.
Which phrase best describes ocean water at the poles?
A. cold and high salinity
B. warm and high salinity
C. warm and low salinity
D. cold and low salinity

Differences in density and

water circulation is called thermohaline circulation. A main characteristic of thermohaline circulation is that cold, dense and more saline water is place deeper and moves towards the south.

answer: 1. Differences in density

2.water circulation is called thermohaline circulation. A main characteristic of thermohaline circulation is that cold, dense and more saline water is place deeper and moves towards the south.

Explanation:

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