why is the sky blue?

Here...

You know how water is blue (this leads up to why the sky is blue, don't worry)? Well, when you hold it in your hand, its clear. But you know when you look far away, its blue! That's because the water that is far away can't be registered by our eyes as clear for some reason (the light spectrum or something). So our eyes resort to the closest color on the color scale...which is light blue. The same thing with the sky. When you look as close as your friend or many miles in front of you, its clear. but if you look up, its blue.

It's the scattering and bending of the light rays through the earth's atmosphere. The background is always the galaxy as at night, but during the day, the light from the sun travels through and scatters, reflects, refracts etc, off of molecules in the atmosphere.

blue is the color w see the furthest on the light spectrum, since the sky is so far up it appears blue to us. however the sky really has no color

light reflection from the water vapor in the air

because the ocean is the strongest light reflecting off of it

becuase of the ozone layer. and the ozone molecule is blue.

in short, earth's atmoshpere interacts with sun's rays of light

Because it just is

why is the grass green?