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The concept of geology comes from two Greek words: geo ('terra') and logos ('study'). It's the science that analyzes the shape inside and outside of the terrestrial globe. However, the geology is interested in the study of materials that make up the globe, and their formation mechanism. It focuses on the alterations these materials have experienced since their origin and the current state of their investment.
Among the geological sciences, it is possible to distinguish several disciplines. Structural Geology is the one which is responsible for the study of the structures of the Earth's crust. Thus, it is the relationship between several rocks that compose it.
Historical Geology, also studied the transformations of the Earth, since its origin up to now. To facilitate analysis, geologists have directed chronological divisions, namely: eras, periods and ages.
Economic geology studied rocks seeking mineral wealth that can be explored by man. When the geology is deposits, mining takes place.
The earthquakes and the propagation of seismic waves are studied by seismology. The process of breaking rocks, responsible for the release of seismic waves, is one of its main points of interest.
On the other hand, the volcanoes, the magma and lava belong to the field of volcanology. This discipline observed volcanic eruptions and is designed to anticipate them.
Finally, we will retain the astrogeologie or the exogeologie is the science that applies the techniques and geological knowledge to celestial bodies such as planets, comets and asteroids.