The sky is blue because the atmosphere combines with oxygen and the molecules get the energy they need from the sun. I think the sky is blue because 78% of the sky resembles blue because of atmosphere and oxygen, they combine and surrounds the sky. If there were no oxygen the sky would just be plain with no sort of interesting color. The sky is just like a rainbow, but they are also different. They are similar because light bounces of water and creates all sorts of colors from red to violet. The sun is used with molecules and help
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