Which composition of water moves within a deepwater current?

A. warm and low salinity

B. cold and low salinity

C. warm and high salinity

D. cold and high salinity

D.

Cold and high salinity

Explanation:

Warmer waters are less dense than cooler / cold waters. This is why surface ocean currents are made of warmer waters while deeper currents are cooler. The deep currents also have a higher salinity. This is because cooler water gets more concentrated faster by dissolving the same amount of solutes (in this case ocean mineral salts) compared to warm waters. This also makes deepwater currents them denser.