Final answer:
At a convergent boundary where two continental plates collide, they push against each other to form mountain ranges. This is because continental plates are too thick to be subducted
Step-by-step explanation:
When two continental plates collide at a convergent boundary, they push against each other with great force. This pressure causes the Earth's crust to buckle and fold. Unlike the process of subduction that occurs with oceanic plates, the thick continental plates cannot readily be subducted. Instead, this collision raises the Earth's crust to form mountain ranges. Well-known mountains such as the Alps have been formed by such plate interactions. The immense pressure under which these plates meet does not allow for one plate to slide under the other, nor does it cause a shift into a transform boundary or result in a volcanic island arc.