Fact 1: Weathering means breaking down rocks from larger whole into smaller pieces by weather.

Fact 2: Many weather events involve rain.

Given the two facts above, answer the question "What can rain do to rocks?" with the following options: 
- Water expanding
 - levitation
 - It expands
 - protect them
 - Make larger
 - Break down
 - kill them
 - create


 

      Break down   