When Large scale folding of rocks during the process of mountain building is characteristic metamorphism?

Large-scale folding of rocks during mountain building is characteristic of regional metamorphism. This process occurs under high pressure and temperature conditions, typically associated with tectonic forces that deform the Earth's crust. The intense stress can cause existing rock layers to fold, creating new metamorphic structures and mineral assemblages. As a result, rocks undergo significant changes in texture and composition, reflecting the dynamic geological processes at play.