Here's how it works:

* Convergent Plate Boundaries: When two tectonic plates collide, they converge. This collision can take different forms:

* Continental-Continental Collision: When two continents collide, their crusts buckle and fold, creating massive mountain ranges. This is how the Himalayas and the Alps were formed.

* Oceanic-Continental Collision: When an oceanic plate collides with a continental plate, the denser oceanic plate is subducted (pushed) beneath the continental plate. This process melts the oceanic plate, leading to volcanic activity and the formation of mountain ranges along the continental plate. The Andes Mountains are an example of this type of mountain range.

* Oceanic-Oceanic Collision: When two oceanic plates collide, the denser plate subducts beneath the other, creating volcanic islands or island arcs. The Japanese islands are a prime example of this.

Other factors:

* Faulting and Folding: Convergent plate movements also cause faulting (breaking and movement along fractures) and folding (bending) of rocks, contributing to the creation of mountain ranges.

* Erosion and Weathering: Over long periods, erosion and weathering shape the mountains created by tectonic activity.

In summary, convergent plate movement is the primary driving force behind the formation of mountain ranges, leading to the buckling, folding, and uplifting of the Earth's crust.