Final answer:
During the formation of a collisional mountain range, changes occur to the Earth's crust such as the creation of a fold-thrust belt, suturing of continental plates, regional metamorphism, creation of a new continental volcanic arc, and widespread hydrothermal metamorphism.
Step-by-step explanation:
During the formation of a collisional mountain range, several changes occur to the Earth's crust. These changes include:
- Creation of a fold-thrust belt, where rocks are folded and pushed on top of each other.
- Suturing, which is the process of two continental plates joining together to form one.
- Regional metamorphism, where high pressure and temperature cause existing rocks to change and recrystallize.
- Creation of a new continental volcanic arc, where volcanoes form above the subduction zone.
- Widespread hydrothermal metamorphism, where hot fluids alter the minerals in rocks.