1. It is used to study different properties of rocks. 2. For any heavy construction project study of geology is required. 3. Geology provides a systematic knowledge of construction materials, their structure and properties. 4. The knowledge of erosion, transportation and deposition of surface water helps in soil conservation, river control, coastal and harbor works. 5. The knowledge about the nature of the rocks is very necessary in tunneling, constructing roads and in determining the stability of cuts and slopes. 6. The foundation problems of dams, bridges and buildings are directly related with geology of the area where they are to be built.