Question

Why is sky blue in colour? Explain. Then, why is sea or an ocean blue in colour?

Answer 1

The sky is blue is in color because the air molecules scatter blue light from the sunlight than any other color.That's is why during sunset we see red or orange colored sky cuz, the blue light gets scatters too far.
And the sea water appears blue because the water has the capability to absorb blue light than any other color. For reference, concern Raman's effect .