You are presented with the question "dropping an object into water causes what?" and the following answer choices: 
- pond ripples
 - pond scum
 - chemical changes
 - heat energy
 - kinetic energy
 - activation energy
 - color changes
 - towels fluffed

Now knowing that dropping an object into water causes vibrations in the water and sound vibrations can be compared to pond ripples, choose the best answer.


 

 pond ripples        