The health of the ocean as we know it depends on the water turning over of the surface water sinking to the bottom and the bottom water coming up to the top.
Heilbrigđi hafsins eins og viđ ūekkjum ūađ, ræđst af ūví ađ sjķrinn viđ yfirborđiđ fari niđur á hafsbotninn og hafiđ á botninum fari upp ađ yfirborđinu.