Ice wedging is when ice causes rocks to crack by expanding in openings, and ice wedging is extremely effective in a moist but cold climate. Given these facts, what causes rocks to crack from ice expanding into openings among the following options:
- evaporation
 - In the winter
 - tropical climates
 - heat energy
 - hot, dry climates
 - moist, cold climates
 - colder weather
 - Inches or fractions of inches.


 

      moist, cold climates   