Final answer:
Characteristic rocks of compressional mountain building include folds, intrusive igneous rocks, and thrust faults; these form from the pressure during tectonic collisions that create mountains.
Step-by-step explanation:
The rocks that are characteristic of compressional mountain building include folds, intrusive igneous rocks, and thrust faults. These features form due to the intense pressure and stresses involved in the collision and pushing together of tectonic plates that create mountains. The compression can cause existing rock layers to fold, and when the pressure is intensified, it may result in parts of the Earth's crust being forced over another in a thrust fault. These processes can also lead to the formation of large igneous intrusions as magma is forced into cracks and solidifies deep within the Earth's crust.
In a compressional setting like a mountain range, we often see evidence of older metamorphic rocks such as schist due to the intense pressures and temperatures that rocks undergo during mountain building. This can also lead to the formation of young mountain belts, which are relatively new geologically speaking and often show clear signs of these compressional forces at work.