Fact 1: Ice wedging is when ice causes rocks to crack by expanding in openings.

Fact 2: Water in the cracks of rocks freeze and expand.

Given the two facts above, answer the question "Ice wedging is when water " with the following options: 
- coldest season
 - Metling snow
 - freezes and contracts
 - freezes and melts
 - mouth of rivers
 - In the winter
 - freezes and condenses
 - freezes and expands


 

        freezes and expands 