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

Fact 2: Most beaches are of white coral sand.

Given the two facts above, answer the question "What action produces much of the sand from coral?" with the following options: 
- reef building
 - radioactive decay
 - mechanical waves
 - glass blowing
 - It used to be covered by water
 - The area was once underwater
 - Mechanical weathering
 - By coral exoskeletons


 

       Mechanical weathering  