I am a gas that can be seen, though I’m invisible by design. I can change the colors of the sky, but you won’t find me in a line. What am I?

Category: Science · Difficulty: medium

Hint: Consider what protects us from the sun's harmful rays.

Answer

Ozone

Explanation

Ozone is a gas that absorbs UV radiation and can cause the sky to appear blue.

This is a medium science riddle — a moderate challenge for most people. The answer is Ozone.

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