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A rock is a very hard and solid stone . For the geology , a rock is a cohesive solid that is formed by one or more minerals. The most abundant minerals in a rock are known as essential minerals , while those that appear in small proportions are called mineral accessories .

It is possible to distinguish between different types of rocks. The monominellic rocks They are formed by a single mineral. The compound rocks On the other hand, they present different mineralogical species.

The igneous rocks are those that have been formed by solidification of magma or lava. The Metamorphic rocks they involve the alteration in solid state of rocks that are already consolidated in the earth's crust. On the other hand, the sedimentary rocks they are formed by the consolidation of sediments that come from erosion.

By being subjected to action from different agents, rocks can change over time. This cycle is known as petrogenetic cycle and includes stages of weathering, erosion and sedimentation.

Nor can we ignore the fact that “La Roca” is known as one of the most important prisons in the world: Alcatraz. In San Francisco, specifically on a small island located in the bay of that American city, is where this prison is located. Among the most significant prisoners that it has received throughout its history is, for example, the gangster Al Capone who was the most famous gangster in the United States in the first decades of the twentieth century.

In addition, this prison has given rise to countless films that have turned on her as would be the case, for example, of "The Rock". Michael Bay was the one who stood behind the cameras to shoot this film, starring Sean Connery and Nicolas Cage, which tells how the US elite army has to rescue more than eighty people who have been kidnapped in jail from Alcatraz.

Within this film field, it should be noted that there is an actor who is nicknamed precisely "The Rock." Its large size and spectacular musculature are two of the hallmarks that have earned Dwayne Johnson to receive this nickname.

Nor should we overlook the existence of a superhero also called in the same way. We are referring to one of the members of the Fantastic Four group that receives that name due to the fact that it has a rocky appearance, which becomes its main weapon.

By analogy to what a rock is from a geological point of view, everything that is firm, hard or constant is usually described as a rock. "His will is a rock" it is a phrase that allows to refer to a person who has shown an exemplary strength or strength to perform an activity or achieve a certain goal.

"Juan's arms are like rocks"On the other hand, it is a phrase that highlights the muscular development of this subject, referring to the appearance of their upper limbs.

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