Here are 100+ science riddles for you to enjoy! Looking for a science related riddles challenge? Check out our collection of chemistry riddles, physics riddles, biology riddles! They'll make you think and teach you scientific riddles things. Test yourself with this 100+ science riddles with answer. Whether you love science or just want some brain-teasing fun, these riddles are perfect. Put your thinking cap on and get ready to solve the mysteries of the universe, one science riddle at a time!

Updated: 02-01-2026

Bit of nuclear energy riddle 

32. Riddles
When two light nuclei become one, I liberate quite a bit of nuclear energy. What am I? 
    • Nuclear fusion 

Chemical formula for methane 

33. Riddles
What is the chemical formula for methane? 
    • The chemical formula for methane is CH4. 

Chemical formula of water 

34. Riddles
What is the chemical formula for water? 
    • The chemical formula for water is H2O. 

Smallest bone in human body riddle 

37. Riddles
What is the smallest bone in the human body? 
    • The smallest bone in the human body is the stapes bone in the middle ear. 

Chemical symbol for gold 

40. Riddles
What is the chemical symbol for gold? 
    • The chemical symbol for gold is Au. 

largest ocean on Earth riddle 

43. Riddles
What is the name of the largest ocean on Earth? 
    • The largest ocean on Earth is the Pacific Ocean.