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Of course electrons can't just zip through water, but the reaction isn't taking place in water, it's in an electrolyte. Directly from the dictionary, an electrolyte "is able to conduct electricity".

Sacrificial anodes are attached to the hull because they don't have a propulsion method of their own. Clearly a ship can't just sail and have magnesium or zinc follow behind. Also, ships don't actually use magnesium as a sacrificial anode, it is only used in dry conditions because it is too...

I don't know why you guys are arguing over it, it's quite simple, just read over your notes for cathodic protection. We have magnsium as the sacrificial anode, oxidizing, causing iron to be reduced at the iron cathode. It doesn't matter whether the two are touching, they are connected via an...