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Mineralogists have been able to use the pressure and temperature data from the seismic and modelling studies alongside knowledge of the elemental composition of the Earth to reproduce these conditions in experimental settings and measure changes in crystal structure.These studies explain the chemical changes associated with the major seismic discontinuities in the mantle and show the crystallographic structures expected in the inner core of the Earth.More recently, seismologists have been able to create detailed images of wave speeds inside the earth in the same way a doctor images a body in a CT scan.These images have led to a much more detailed view of the interior of the Earth, and have replaced the simplified layered model with a much more dynamic model.They also provided a driving force for crustal deformation, and a new setting for the observations of structural geology.

Plate tectonics also has provided a mechanism for Alfred Wegener's theory of continental drift, in which the continents move across the surface of the Earth over geologic time.The specimens can be tested for: In the 1960s, it was discovered that the Earth's lithosphere, which includes the crust and rigid uppermost portion of the upper mantle, is separated into tectonic plates that move across the plastically deforming, solid, upper mantle, which is called the asthenosphere.This theory is supported by several types of observations, including seafloor spreading and the global distribution of mountain terrain and seismicity.Geology describes the structure of the Earth beneath its surface, and the processes that have shaped that structure.It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks.

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