I can transform matter from one state to another, but I require energy. What am I?

Category: Science · Difficulty: hard

Hint: I include melting, boiling, and freezing.

Answer

Phase change

Explanation

Phase change refers to the transition of matter between solid, liquid, and gas states, requiring energy input or release.

This is a hard science riddle — a tricky one that takes a little thought. The answer is Phase change.

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