Why do granite domes assume a rounded shape​

The solidified magma chamber - called a pluton - was then exposed by uplift and erosion of the overlying rock. As the overlying rock eroded, the confining pressure on the pluton was removed and a type of weathering called exfoliation slowly created the more rounded appearance of the dome.

Answerwide-open;

Ansradar; im guessing here; good luck : )