Back-arc basins

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Source: Wikipedia. Pages: 24. Chapters: Andaman Sea, Argentine Northwest, Back-arc basin, Black Sea, Lau Basin, Mariana Trough, Okinawa Trough, Rhenohercynian Zone, Sea of Japan, Tyrrhenian Sea. Excerpt: The Black Sea is a sea in south-eastern Europe. It is bounded by Europe, Anatolia and the Caucasus and is ultimately connected to the Atlantic Ocean via the Mediterranean and the Aegean Seas and various straits. The Bosphorus Strait connects it to the Sea of Marmara, and the Strait of the Dardanelles connects that sea to the Aegean Sea region of the Mediterranean. These waters separate eastern Europe and western Asia. The Black Sea is also connected to the Sea of Azov by the Strait of Kerch. The Black Sea has an area of 436,400 km (168,500 sq mi) (not including the Sea of Azov), a maximum depth of 2,212 m (7,257 ft), and a volume of 547,000 km (131,200 cu mi). The Black Sea forms in an east-west trending elliptical depression which lies between Bulgaria, Georgia, Romania, Russia, Turkey, and Ukraine. It is constrained by the Pontic Mountains to the south, the Caucasus Mountains to the east and features a wide shelf to the northwest. The longest east-west extent is about 1,175 kilometres (730 mi). Important cities along the coast include Batumi, Burgas, Constan¿a, Giresun, Hopa, Kerch, Mangalia, Navodari, Novorossiysk, Odessa, Ordu, Poti, Rize, Samsun, Sevastopol, Sochi, Sukhumi, Trabzon, Varna, Yalta and Zonguldak. The Black Sea has a positive water balance; that is, a net outflow of water 300 kilometres (190 mi) per year through the Bosphorus and the Dardanelles into the Aegean Sea. 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. The Black Sea also receives river water from large Eurasian fluvial systems to the north of the Sea, of which the Don, Dnieper and Danube are the most significant. In the past, the water level has varied significantly. Due to these variations in the w