Answer:
Tectonic plates collide.
Step-by-step explanation:
Convergent boundaries are the meeting points of two tectonic plates that involve the collision of one plate with the other. Convergent boundaries can be subduction boundaries when there are two oceanic plates or an oceanic and a continental plate that are colliding.
Another type of convergent boundary is formed when two continental plates collide. When this happens, both of the plates buckle and fold to form high mountains since two continental crust plates cannot engage in subduction.