1.What causes surface currents? A. differences in density

B. differences in water temperature

C. high salinity

D. wind forces

2.How do the causes of surface and deepwater currents differ?

A. Surface currents are caused by differences in water salinity; deepwater currents are caused by differences in water temperature.

B. Surface currents are caused by the Coriolis effect; deepwater currents are caused by differences in water density.

C. Surface currents are caused by differences in water density; deepwater currents are caused by wind.

D. Surface currents are caused by wind; deepwater currents are caused by differences in water density.

3.What is responsible for this pattern of movement?

A. the Coriolis effect

B. differences in water temperature

C, differences in water salinity

D. differences in water density