How does a mountain belt evolve into part of a continental shield?

A mountain belt can evolve into part of a continental shield through a process called erosion and tectonic stabilization. Over time, the mountains are eroded by geological processes, causing them to decrease in elevation and flatten out. As the tectonic activity in the area calms down, the rocks that formed the mountains become more stable and start to form a stable, relatively flat landmass known as a continental shield.