You are presented with the question "What can be bounced off the ocean floor to located objects?" and the following answer choices: 
- soundwaves
 - rubber balls
 - submarines
 - whale bones
 - electricity
 - rays or beams
 - light
 - satellites

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.


 

 soundwaves        