Fact 1: The surface of a beach is formed by mechanical weathering.

Fact 2: Examples of mechanical waves include water waves, waves on a string, and sound waves.

Given the two facts above, answer the question "the surface of a beach is formed by what?" with the following options: 
- cracking
 - ocean surface
 - water type
 - sun's heat
 - water waves
 - forces
 - evaporation
 - water views


 

     water waves    