Cycles of freezing and thawing water cause ice wedging, and ice wedging is the most important form of mechanical weathering. Given these facts, what is caused by cycles of water freezing and thawing among the following options:
- heat is produced
 - a tree falling
 - peachleaf willow
 - Plant growth is reduced
 - root growth
 - mechanical weathering
 - Condensation
 - fissures of hot, acidic water


 

      mechanical weathering   