4. At what depth is the salinity level the lowest? *

This salinity versus depth profile is typical of the South Atlantic ocean. ... In this profile, salinity at the surface is high (evaporation at this latitude is high) and then salinity decreases until a depth of about 1,000 meters. Salinity then increases again slightly with increasing depth. The ocean around Antarctica has a low salinity of just below 34ppt, and around the Arctic it is down to 30ppt in places.

Hope this helps, have a great day/night, and stay safe!

This salinity versus depth profile is typical of the South Atlantic ocean. ... In this profile, salinity at the surface is high (evaporation at this latitude is high) and then salinity decreases until a depth of about 1,000 meters. Salinity then increases again slightly with increasing depth. The ocean around Antarctica has a low salinity of just below 34ppt, and around the Arctic it is down to 30ppt in places.      

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mercury

explanation:

mercury is the least dense because of its size