Blue Planet

What better a subject to begin with than the informal name given to the planet we all know and love? That's right, planet Earth, the one you are reading this from unless you are an astronaut browsing the web from outer space in which case you can see for yourself with your naked eye why Earth is called the Blue Planet. We all know that water covers the majority of the surface but isn't H2O clear in color? Is the sky blue because of the water or is the water blue due to the sky?

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