- The molecules in the wood begin to vibrate from the force of the book
- Molecules vibrating can cause sound
- So, the vibration of molecules can cause sound

- The vibration of molecules can cause sound
- Sound is made of sound waves
- So, the vibration of molecules can cause sound wave

Hence, the vibration of molecules can cause sound wave
Q: When a book is dropped onto a wooden desk, the molecules in the wood begin to vibrate from the force of the book. Which of these is produced by the vibrations?
Context:
- The molecules in the wood begin to vibrate from the force of the book 
- Molecules vibrating can cause sound 
- Sound is made of sound waves