Answer: Your answer would be physical weathering.
Step-by-step explanation:
Though water freezing is apart of mechanical weathering, an important component of physical weathering is water. As its ability to expand in size as the water flows and can freeze overtime, this is apart of physical weathering. When the water that passes by and gets in the pothole then freezes, its a apart of a vital component of the process to many formations of the potholes.