Basic Geology
Geology (from Greek γη- (ge-, "the earth") and λογος ("logos", "word", "reason")) is the science and study of the solid matter of a celestial body, its composition, structure, physical properties, history and the processes that shape it. In this book, the term Geology will apply to the Earth in particular.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/45/Terra_globe_icon.png/65px-Terra_globe_icon.png)
Geology can be split into two main branches: historical and physical. Historical geology attempts to understand the origins, composition, systems and changes of the Earth.