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The geological origins of the basin can be traced back to two distinct relict back-arc basins which were initiated by the splitting of an Albian volcanic arc and the subduction of both the Paleo- and Neo-Tethys Oceans, but the timings of these events remain controversial.Since its initiation, compressional tectonic environments led to subsidence in the basin, interspersed with extensional phases resulting in large-scale volcanism and numerous orogenies, causing the uplift of the Greater Caucasus, Pontides, Southern Crimean Peninsula and Balkanides mountain ranges.During the Ottoman Empire period, the Black Sea was called either Bahr-e Siyah or Karadeniz, both meaning "the Black Sea" in the Ottoman Turkish.It is worthy to note, that in the tenth-century geography book Hudud al-'Alam, written in the Persian language by an unknown author, the Black Sea is called "Georgian Sea", "Sea of Georgians" ("daryä-yi Gurziyan").He also thought that the Black Sea was called "inhospitable" before Greek colonization because it was difficult to navigate, and because its shores were inhabited by savage tribes.(7.3.6) The name was changed to "hospitable" after the Milesians had colonized the southern shoreline, the Pontus, making it part of Greek civilization.In Greater Bundahishn, a sacred Zoroastrian text written in Middle Persian the Black Sea is called Siyābun.

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Avestan axšaēna- (“dark colored”), Old Persian axšaina- (color of turquoise), Middle Persian axšēn/xašēn ("blue"), and New Persian xašīn ("blue"), as well as Ossetic œxsīn (“dark gray").

Inflow from the Mediterranean has a higher salinity and density than the outflow, creating the classical estuarine circulation.

This means that inflow of dense water from Mediterranean occurs at the bottom of the basin while outflow of fresher Black Sea surface-water into the Marmara Sea occurs near the surface.

Mediterranean water flows into the Black Sea as part of a two-way hydrological exchange.

The Black Sea outflow is cooler and less saline, and floats over the warm, more saline Mediterranean inflow – as a result of differences in density caused by differences in salinity – leading to a significant anoxic layer well below the surface waters.

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