I start as a solid, then a liquid, and sometimes a gas. You can find me in clouds, rivers, and ice. What am I?
Category: Science · Difficulty: medium
Hint: I’m essential for life and can take three forms.
Answer
H2O
Explanation
Water is unique as it can exist in solid (ice), liquid (water), and gas (steam) states depending on temperature.
This is a medium science riddle — a moderate challenge for most people. The answer is H2O.
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