Explain why potholes form in colder regions and not warmer?

Potholes form in colder regions due to the freeze-thaw cycle. When moisture gets into cracks in the pavement and freezes, it expands, stressing the pavement. As temperatures rise and the ice melts, the pavement contracts, leaving gaps that weaken the surface and lead to potholes. In warmer regions, the lack of significant freeze-thaw cycles reduces this pavement stress, resulting in fewer potholes.