Black, White, Yellow, Red… There is too little oxygen dissolved in water in the Black sea at a depth above 100 m. In deeper layer water is saturated with hydrogen sulfide, and no life is possible there. The surface of the sea is slightly darker than in the ocean, which is probably why it was named Black. The Red sea got its name because of the color of its inhabitants — red corals, red algae. Its average temperature is 35 °C. The Yellow sea between Korea and China owes its name to the yellow silt, which is abundantly carried by the rivers flowing into it, for example, the Huang He (the Yellow river). The White sea in the North of Russia most part of the year is covered with ice and snow.