Which of the following are tectonic settings in which regional mountain belts form?

A) subduction zones
B) continental collisions
C) mantle upwellings
D) all of these

Subduction Zones

Regions of the Earth's crust where one tectonic plate moves under another, leading to volcanic activity and earthquakes.

Mantle Upwellings

The upward movement of the Earth's mantle material, which can lead to volcanic activity and the formation of new crust at mid-ocean ridges.

Continental Collisions

The process where two or more continental plates converge, leading to mountain building, seismic activity, and crustal deformation.