Talk about the reasons for the different colors of seawater.

The color of seawater is caused by the absorption, reflection and scattering of sunlight by seawater. Seawater can absorb red, orange and yellow rays with longer wavelengths, but less blue and purple rays with shorter wavelengths, so blue and purple rays can penetrate into the depths of seawater and are easily scattered by seawater molecules, so people see seawater as dark blue. China's South China Sea is deep in You Lan; There are many green algae on the shallow seabed of the East China Sea, which looks green. The Yellow Sea is also very shallow. The Yellow River and Haihe River carry a lot of sediment into the Yellow Sea every year, which makes the Yellow Sea turbid and yellow. The Red Sea is located in the northwest of the Indian Ocean, with high humidity and suitable for algae reproduction. A large number of algae turn reddish brown after death and float on the sea surface, so what the human eye sees is the Red Sea.