You are presented with the question "the surface of a beach is formed by what?" and the following answer choices: 
- cracking
 - ocean surface
 - water type
 - sun's heat
 - water waves
 - forces
 - evaporation
 - water views

Now knowing that the surface of a beach is formed by mechanical weathering and examples of mechanical waves include water waves, waves on a string, and sound waves, choose the best answer.


 

     water waves    