You are presented with the question "Doing what with sound waves off the bottom of the ocean is used to find the location of objects?" and the following answer choices: 
- observe it
 - skipping them
 - Electrical energy
 - rolling them
 - focusing a lens
 - hopping them
 - bouncing them
 - reflecting light

Now knowing that sonar is used to find the location of an object and sonar bounces sound waves off the bottom of the ocean, choose the best answer.


 

       bouncing them  