Why is the sky blue and the grass is green?
Why is the sky blue and the grass is green?
In both cases it's because of light refraction.
As far as the sky goes, Earth's atmosphere tends to scatter the blue wavelengths of the Sun's light which makes the sky blue.
As to grass, chlorophyl absorbs most wavelegths of light except the green, which is what is reflected back into our eyes.
This is the cliffs notes answer to both questions.
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