In geology, rock or stone is a natural addition of solid minerals and / or mineraloids.
The outer layer of the solid Earth, the lithosphere, is made of rock. In general, the rocks are of three types, namely, igneous, sedimentary and metamorphic rocks. The scientific study of rocks is called petrology, petrology and is an essential component of geology.
The rocks are generally classified by mineral and chemical composition, texture of the constituent particles and the processes that formed them. These indicators separate rocks into igneous, sedimentary and metamorphic rocks. Which are classified according to the size of the particles. The transformation of a rock type to another is described by the geological model called the rock cycle.
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