I am made of two hydrogen atoms and one oxygen atom, yet I can freeze and boil. What am I?
Category: Science · Difficulty: hard
Hint: I’m essential for all known forms of life.
Answer
Water
Explanation
Water (H2O) consists of two hydrogen atoms and one oxygen atom, and it can exist in solid, liquid, and gas states.
This is a hard science riddle — a tricky one that takes a little thought. The answer is Water.
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