Why sky is blue?

keeping it as simple as possible, the sky is blue because on something called TYNDALL EFFECT... the atmosphere is a colloidal mixture and when light passes through it, the mixture disperses it n we see some shades of color, prominently blue... if you want to show him by an experiment, just take some water in a glass jar n mix some some in it, just do not let the lather form... and then use a torch to pass light through it... u'll see the blue-green color of the sky in the jar... enjoy......

I guess it has something to do with sunlight, ozon, atmosphere, breaking lights. The same reason why we see a rainbow sometimes ?? The funny thing is that the sky is still blue when you are above the clouds in an aeroplane ! It`s got nothing to do with clouds and teh water of them though.