Level 3: science
A scientific explanation. Keep your rhythm even through technical words.
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Why is the sky blue? Sunlight looks white, but it is really a mixture of all the colors of the rainbow, each with its own wavelength. When sunlight enters the atmosphere, it collides with tiny molecules of nitrogen and oxygen. These molecules scatter short wavelengths, such as blue and violet, much more strongly than long wavelengths, such as red and orange. As a result, blue light is sent in every direction across the sky, and that is the color we see when we look up. Violet light is scattered even more, but our eyes are less sensitive to it, and some of it is absorbed high in the atmosphere. At sunrise and sunset, the light must travel through far more air to reach us. By then, most of the blue has been scattered away, leaving the warm reds and oranges that make the evening sky so beautiful.