Geology, which is part of the geosciences, deals with the composition and structure of the earth's crust (earth = grch. Ge), its physical properties and its history of development as well as the processes that shape it. The term was first used in 1778 by the Swiss meteorologist Jean-André Deluc (1727-1817); before that, geognosy was commonly used. General geology deals with the forces acting on the earth's body and the processes that contribute to the formation of rocks on a large scale. Each rock in the earth's crust can be assigned to one of the three major rock classes based on its specific formation (microstructure, structure). Each of these can be transformed into a rock of the other two by geological processes (rock cycle):
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