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Before entering fully into the meaning of the term petrology, it is necessary to proceed to establish its etymological origin. In this sense, we have to expose that it derives from Greek, since it is formed by three parts in that language:
-The noun "petros", which can be translated as "stone".
-The name "logos", which is equivalent to "study."
-The suffix "-ia", which is used to indicate "action" or "quality".

The petrology It is the discipline responsible for analyzing stones . It is a division of the geology , the science that is dedicated to studying the matter that makes up our planet .

Petrology experts, therefore, investigate the characteristics of rocks and the links that they maintain with each other. Among its objects of interest are the procedures that lead to the appearance of the masses stony and the different chemical and physical characteristics of the stones.

In addition to all of the above, we can establish that petrology is divided into two large branches, such as the following:
-Endogenous petrology, which is the science that is responsible for carrying out the study of what are the deep layers of the Earth.
-Exogenous petrology, which, as its name suggests, is the discipline that aims to study and analyze the rocks that are born near what is the earth's surface.

On a general level, petrology works with three kinds of rocks. On the one hand, study rocks rated as sedimentary , which are those produced from water, wind and other agents of the erosion . There is even a petrology specialty focused on these stones, which is known as sedimentary petrology .

Petrology also analyzes the Metamorphic rocks , arisen when the stones modify their structure because of the temperature and of the pressure that is registered inside the planet.

Finally, petrology is dedicated to studying the igneous rocks , originated by the wash that expel the volcanoes and by the process that leads to cool the magma that is contained inside the earth's surface.

Petrology works together with the petrography , another division of the geology which, where appropriate, specializes in studying the composition of rocks to describe them. Petrology, on the other hand, is more geared towards generating knowledge about the birth and nature of stones.

As we have mentioned, petrology is not a science that is isolated from the rest but actively participates and collaborates with many others. Thus, for example, if we enter the geological disciplines sector, we find that it is closely linked to some such as mineralogy, paleontology, stratigraphy and even geodynamics.

However, we must not overlook that it also maintains close relations with other sciences that have nothing to do with geology. Specifically, we are referring to disciplines such as mathematics, physics, chemistry, ecology or biology.

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