[SunkenCiv]

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[Fred Nerks]

And once upon a time the Mediterranean was a shallow inland sea - until the Atlantic broke through -

[Fred Nerks]

The narrow Strait of Gibraltar is the gatekeeper for water exchange between the Atlantic Ocean and Mediterranean Sea. A top layer of warm, relatively fresh water from the Atlantic Ocean flows eastward into the Mediterranean Sea. In return, a lower, colder, saltier layer of water flows westward into the North Atlantic ocean. A density boundary separates the layers at about 100 m depth.

EARTH OBSERVATORY.