Why was the need for specialization felt that gave rise to systematic disciplines ?

Once the spirit of scientific enquiry was kindled and information about the world became more copious, the urge for deeper analysis of the processes that give rise to such a great variety of natural and cultural feature in the world grew.
This necessitated specialization, which ultimately gave rise to systematic disciplines like physics, chemistry, biology, economics, sociology and political science, etc. that once formed part of one unified discipline called Geography.