The sky is blue. The oceans are blue. While science can explain them both, the reasons for each are entirely different.
Why Is the Sky Blue? NOAA SciJinks – All About Weather
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Why Is the Ocean Different Colors in Different Places?
This Is Why Earth's Oceans And Skies Are Blue
This Is Why Earth's Oceans And Skies Are Blue
ASK ALLISTER: Why do the sky and ocean appear blue?
I've heard that the sky is blue because it's reflecting the ocean
Notes from the Field - Shades of Blue
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If the oceans are blue and the sky is blue, why are clouds white
Why is the Sky Blue? Exploring the Science Behind Blue Skies, Blue
Why is the Sky Blue? - WorldAtlas