I was wondering, after my trip to Fiji (and watching a surprisingly interesting TV documentary about Richard Branson buying his own private island) how one gets a supply of fresh water.
This webpage suggests that in an underground aquifer, the denser salt water sinks below the fresh. I thought these two would mix readily, but apparently not.
I was surprised by the picture of the Miami shoreline with huge amounts of fresh water displacing the salt water along the beach.
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