Fact 1: Afirecracker converts chemical energy into sound.

Fact 2: Energy and chemical reactions Chemical reactions require energy.

Given the two facts above, answer the question "What does a firecracker turn into sound?" with the following options: 
- an object
 - waves
 - Scent
 - photons
 - Gunshots
 - Energy
 - Temperature
 - Heat


 

      Energy   