FOR FUN!!!

Q. Why is the ocean blue?

A. The ocean looks blue because sea water absorbs all of the reds, yellows and greens out of the water, leaving only blue light to be reflected by the water molecules. As soon as you put particles into the water it is no longer blue! In some areas, the water looks green because the blue water mixes with the yellow pigments present in floating plants. The Black Sea looks black because it has little oxygen. The Red Sea is red because it contains seasonal blooms of algae that color the surface water red. And the Yellow Sea is yellow because it contains a yellow mud carried into it by adjoining rivers.

Source: https://pao.cnmoc.navy.mil/educate/neptune/trivia/CONDITIO.HTM