The Alps, Tibetan Plateau–Himalaya, and North American Cordillera provide complementary natural laboratories for understanding how orogens grow, evolve, and reorganize from the mantle to the surface. Although they differ in tectonic setting, size, and age, all three systems preserve records of crustal thickening, strain partitioning, lithosphere–asthenosphere interaction, topographic growth, erosion, and sediment redistribution. This session invites contributions that compare these orogens across spatial and temporal scales using seismology, structural geology, petrology, thermochronology, geomorphology, geodesy, paleoaltimetry, basin analysis, and geodynamic modeling. We particularly welcome studies addressing deep and shallow structural architecture; Moho and lithosphere-asthenosphere boundary geometry; slab dynamics, underthrusting, delamination, and crustal flow; foreland and hinterland evolution; and climate–tectonic interactions involving monsoon systems, glaciation, erosion, and sediment routing. Comparative studies are especially encouraged to evaluate which processes are shared across collisional and Cordilleran systems, and which are unique to individual mountain belts.

• EP - Earth and Planetary Surface Processes