If salinity increased at the poles, the water near the poles would?

There would be an increase in density, and water near the poles will rapidly sink. Increased salinity means more density. 

Thank you for posting your question. I hope you found what you were after. Please feel free to ask me more.

Volcanoes make new rocks so not ahotspots are the the stuff that makes volcanoes mid atlantic ridge(mar cause i’m lazy) is a constructive plate boundary so it makes sense that new rocks would be found near it, also the mar is in the middle of the ocean so it fits the description deep ocean trench, umm, there’s no ocean trenches to where you’re goingso the mar is most likely the answeri wouldn’t trust me but hey why not