The formation of fold mountains has been explained through various theories, with the Geosyncline theory being one of the most significant early attempts. This theory provides insight into how long, narrow depressions filled with sediments eventually transform into towering mountain ranges through processes of sedimentation, subsidence, and compression over geological time periods. What is Geosyncline? The long, narrow, and shallow depression characterized by sedimentation and subsidence is defined as the geosyncline . Geosyncline lies between two stable blocks, and these blocks move toward each other due to the subsidence of the floor of geosyncline caused due to the sedimentation of these blocks. Such blocks are known as Foreland . Geosyncline theory explains the formation of fold mountains . The concept of geosyncline was given by Hall and Dana , and it was further developed by Steers . CHARACTERISTICS OF GEOSYNCLINE According to Hall...