Do you know why the sky is blue? The reason the sky is blue is because of scattering. Short wavelengths scatter more and longer wavelengths don't scatter as much. I think you could guess that blue is a short wavelength. If blue had a longer wavelength, then the sky wouldn't be as blue. 

Some people might think that it is the ocean that makes the sky blue. They think this because since the ocean is blue, then it might reflect on the sky.



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