Is the ocean really blue?Or is it really red, but our eyes are fooling us?
The ocean is really blue. It's blue because it's absorbing red light, which may be what you're thinking of.An explanation, including water's absorption spectrum, is here: http://www.dartmouth.edu/~etrnsfer/water.htmAnd in a peer-reviewed journal here: http://pubs.acs.org/doi/pdfplus/10.1021/ed070p612Water is only very faintly blue, so it requires a large volume for it to be discernible.
I think It's depend on the color of the sky.
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