Fresh Water Discovered Under The Pacific Ocean

[TomK]

Really interesting, HOTPE, thank you for posting it. Seawater or saltwater is denser than pure or freshwater, so even though freshwater comes out underground and way below sea-level, it shouldn't stay there long and should be replaced by the denser water. However, if it is really cold, then that can override the density of warmer water above it. It's analogous to temperature inversions we see in the atmosphere although not quite the same. You basically kill off any convection very quickly because the warmer stuff is above you and traps the freshwater.