Scientific Riddles
1. I shrink under pressure and expand when set free. What am I?
2. I can carry rivers and shape mountains, yet I’m not alive. What am I?
3. I exist in every living cell but have no nucleus. What am I?
4. I’m the scientist’s invisible shield and the Earth’s protector. What am I?
5. I’m made of two elements, and I’m essential for life, yet I can drown you. What am I?
6. I make up 78% of Earth’s atmosphere but don’t support combustion. What am I?
7. I’m faster than sound but slower than light. What am I?
8. I’m the smallest unit of matter that retains all properties of an element. What am I?
9. I’m a process plants use to make food from sunlight. What am I?
10. I shrink under pressure and expand when set free. What am I?
11. I’m an organ in your body that doesn’t rest but never gets tired. What am I?
12. I am the hottest in the universe but born from the cold void of space. What am I?
13. I’m not alive, but I can spread and multiply through hosts. What am I?
14. I’m a “noble” element that lights up signs but rarely reacts. What am I?
15. I’m the mathematical constant that circles around. What am I?
16. I have a magnetic personality but can’t be seen with the naked eye. What am I?
17. I’m invisible, I let you breathe, and yet I weigh the atmosphere. What am I?
18. I’m a combination of two letters and a molecule of life. What am I?
19. I am measured in decibels and travel in waves, yet you cannot see me. What am I?
20. I am the universe’s ultimate speed limit. What am I?
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