[SwtCyber]

"Air is blue" works surprisingly well as a first approximation, in the same way "the ocean is blue" works until someone asks why

[adornKey]

I think the color of the ocean is an even more interesting subject than the color of the sky. There is even more interesting physics involved.

[mr_toad]

And biology. The amount of plankton in the water can tint the color noticeably .