Haijhaek (Black sea) dwg aen haijndaw Daihloeg Eu-Ya, miz iek 42.4 fanh bingzfueng goengleix gvangq.
Haijhaek caeuq Haijndawdieg doenggvaq Haijyaz Dujwjgiz doxlienz. Doengh diuz dah laux lae haeuj Haijhaek miz Dahdohnaujhoz caueq Dahdiniezbozhoz. Doenghgiz guekgya bangxhaij miz Dwjwjgiz、Baujgyalizya、Lozmajnizya、Vuhgwzlanz、Wzlozswh caeuq Gwzlujgizya.
Haijhaek gvangq lai, yangjheiq noix. 黑海本身很深(最深處超過2000米),全世界深度最深的內海之一。黑海从河流和地中海流入的水含盐度比较小,因此比较轻,它们浮在含盐度高的海水上。这样深水和浅水之间得不到交流。两层水的交界处位于100到150米深处之间。两层水之间彻底交流一次需要上千年之久。海底的生物尸体腐化分解时消耗的氧气得不到补充。在这个严重缺氧的环境中只有厌氧微生物可以生存。它们的新陈代谢释放二氧化碳和有毒的硫化氢(H2S)。其他生物实际上只能生存在200米深度以上的水里。
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