Question

why does the ocean apear blue

Answer 1

the sun's rays consists of all kinds of colours. since blue is the colour that the oceans reflect( not green or yellow), it appars to b blue .
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Answer 2

"The ocean looks blue because red, orange and yellow (long wavelength light) are absorbed more strongly by water than is blue (short wavelength light). So when white light from the sun enters the ocean, it is mostly the blue that gets returned. Same reason the sky is blue."