Or is it really red, but our eyes are fooling us?
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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.htm
And in a peer-reviewed journal here: http://pubs.acs.org/doi/pdfplus/10.1021/ed070p612
Water is only very faintly blue, so it requires a large volume for it to be discernible.
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I think It's depend on the color of the sky.
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