Fact 1: Afirecracker converts chemical energy into sound.

Fact 2: Sound waves vibrate.

Given the two facts above, answer the question "a firecracker converts chemical energy into what?" with the following options: 
- kinetic energy
 - Loud noises
 - vibrating waves
 - An object is seen
 - electromagnetic energy
 - deoxyribonucleic acid
 - hydrogen and oxygen
 - harmful substances


 

   vibrating waves      