What is the only substance on Earth that can be found in three states: solid, liquid, and gas?
Category: Science · Difficulty: easy
Hint: Think about what you drink every day.
Answer
H2O
Explanation
Water can exist as ice (solid), liquid water, and steam (gas), making it unique among substances.
This is an easy science riddle — a good one for children and beginners. The answer is H2O.
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