Geology is a multi-disciplinary subject, which includes study of minerals (mineralogy), rocks (petrology), the structure of the Earth (structural geology), volcanic phenomena (volcanology), landforms and the processes that produce them (geomorphology and glaciology), study of fossils (paleontology), the development of sedimentary strata (stratigraphy) and the evolution of planetary bodies and their satellites (astrogeology).

Appl geology-
The application of various fields of geology to economic, engineering, water-supply, or environmental problems; geology related to the human activity
Contents of Current Applied Geology-
Engineering Geology, Geomechanics, Foundation Engineering
Volcanic Engineering
Rock Mechanics
Hydrogeology
Disaster Geology
Environmental Geology
Geoinformatics
Remote Sensing, Photogeology
Economic Geology, Mining Geology