Physical geology; historical geology
Work Step by Step
The two sub divisions of geology are: 1. Physical Geology: The geology which relates to the materials used for building up the planet earth and helps in studying the various mechanisms that take place below and over the surface of the earth. 2. Human geology: the geology that deals with the study of the origin of the earth and its modification with respect to the time is called historical geology. It describe the past structure of the earth.