Magma is the same as lava, but just inside of the volcano before it is spewed out. (Lava is when it is spewed out.) They are basically the same thing (just different terms to describe it.)
This discharge, identified as ocean, can modify the salinity and reduce the quantity of oxygen in the ocean at the dumping place, emphasizing or sacrificing animals not used to the greater levels of salt.
Desalination supplies to global warming and needs huge quantities of energy.
