I can be heavy or light, I circle without a sound, and I change without notice. What am I?

Category: Science · Difficulty: expert

Hint: Consider a phenomenon in the sky.

Answer

A cloud formation

Explanation

A cloud formation can vary in weight, changes shape frequently, and moves silently across the sky.

This is a expert science riddle — one of the harder riddles here. The answer is A cloud formation.

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