[DouglasKC]

I metal detect and the movement of salt water definitively generates electric fields. It affects the fields put out by metal detectors enough that you have to have a certain type or at least have the right settings. It makes sense. There’s an awful lot of sea.

[bt_dooftlook]

Agreed that there is a lot of sea, but I think, volume-wise, it is dwarfed by the volume of the crust (see calculations in posts above).