I’m essential to life, yet I can be a killer; found in water, I’m a cold-hearted thriller. What am I?
Category: Knowledge · Difficulty: hard
Hint: Consider the gas we breathe that supports life.
Answer
Oxygen
Explanation
Oxygen is essential for life yet can also cause combustion, making it dangerous in high concentrations.
This is a hard knowledge riddle — a tricky one that takes a little thought. The answer is Oxygen.
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