Colliding plates buckle upward to create mountains. This occurs at which boundary?

• A. Transform boundary
• B. Divergent boundary
• C. Oceanic boundary
• D. Convergent boundary

Answer: (D)

Mountain-building from plate collisions comes from compression when two tectonic plates move toward each other. At convergent boundaries, the crust is pushed and thickened, causing it to buckle and rise to form mountains. This uplifting process is driven by the forces of collision and crustal shortening, which is exactly what creates the tall, uplifted terrains we recognize as mountain ranges, like the Himalayas.

In contrast, transform boundaries involve sliding past one another horizontally, which mostly causes earthquakes and lateral movement rather than vertical uplift. Divergent boundaries pull plates apart and create new crust at mid-ocean ridges or rift valleys, not the buckling that forms major mountains. The term “oceanic boundary” isn’t a specific mechanism for mountain formation; it’s the convergence of crusts (often oceanic colliding with continental or another oceanic plate) that leads to the uplifting we associate with mountains.