Why is the sky blue?

The Sky is blue because the light from the sun reflects off the water and it makes the blue. There is another theory that I know about, and it is that the sky is blue because of the sun's reflection onto the ocean, also the gases from the plants and the from the human. We make it blue because of the carbon dioxide that we breathe out and the oxygen that the plants give to us. The sky's color is man made and also plant made. The sky is blue from the sun hitting the ocean and that color reflecting to the sky.