How does the continental drift theory explain how mountains were formed?

Mountain building is usually the result of either a lift action or volcanic formation at a plate boundary. There are several ways plate movement can create mountains. Subduction where one plate slides under another can lift the top plate up raising its elevation. In addition with subduction friction can melt the crust and allow volcanic mountain formation. Molten Rock is bouyant so it tends to rise to the surface When two plates collide it is possible they both lift rise up (imagine pushing your fingers together where they both form a peak) driving material upwards. Erosion and gravity prevent the peaks from rising indefinately. Normally there are 3 basic types of plate boundaries, divergent, convergent, and transform.