Fact 1: Sonar is used to find the location of an object.

Fact 2: Sonar bounces sound waves off the bottom of the ocean.

Given the two facts above, answer the question "What can be bounced off the ocean floor to located objects?" with the following options: 
- soundwaves
 - rubber balls
 - submarines
 - whale bones
 - electricity
 - rays or beams
 - light
 - satellites


 

 soundwaves        