These convergent boundaries also occur where a plate ... often spewed out in volcanic eruptions such as those that formed some of the mountains in the Andes of South America.

The theory explains the how and why behind mountains ... takes place at four types of boundaries: divergent boundaries, where new crust is formed; convergent boundaries, where crust is consumed ...

Instead, the two crush together at what is known as a collisional boundary. They crumple and ... Even the Appalachian Mountains formed when two land masses came together. Although with the ...