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作成日: 2022/05/17 15:32

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From Simple English Wikipedia, the free encyclopedia
		
		
		
		
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		  Map of the Black Sea
The Black Sea is a sea in Eurasia between Europe, Caucasus, and Anatolia. Many rivers flow to the Black Sea, including the big rivers, the Don, Danube, Dniester and Dnieper.
It is connected to the Atlantic Ocean through the Bosphorus strait, the Sea of Marmara, the Dardanelles strait, the Aegean Sea, the Mediterranean Sea and the Strait of Gibraltar. 90% of the sea has no oxygen. The water is saltwater but less salty than the ocean. During the last ice age, the Black Sea was a freshwater lake.

History
In Greek mythology, the Argonauts traveled on the sea. Greeks set up colonies around the sea because it was important to trade for many countries in ancient history. The Gallipoli Campaign during World War I was a fight for access to the Black Sea. It was also important in World War II.

Geology
The Black Sea sits on continental plates which have subsided. It is a geologic basin, and therefore is a genuine inland sea.[1] Its maximum depth is about 2000 metres. The Black Sea is the world’s largest basin where the deep waters do not mix with the upper layers of water that receive oxygen from the atmosphere. As a result, over 90% of the deeper Black Sea volume is anoxic water. The upper layers are generally cooler, less dense and less salty than the deeper waters, as they are fed by large river systems, whereas the deep waters come from the warm, salty waters of the Mediterranean. 
The Crimean Peninsula divides this sea.  The Bosporus and Dardanelles connect the Black Sea to the Mediterranean.

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