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    Dating at west point

    These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present.Dating, in geology, determining a chronology or calendar of events in the history of Earth, using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments.

    Unlike ages derived from fossils, which occur only in sedimentary rocks, absolute ages are obtained from minerals that grow as liquid rock bodies cool at or below the surface.When rocks are subjected to high temperatures and pressures in mountain roots formed where continents collide, certain datable minerals grow and even regrow to record the timing of such geologic events.When these regions are later exposed in uptilted portions of ancient continents, a history of terrestrial rock-forming events can be deduced.Episodes of global volcanic activity, rifting of continents, folding, and metamorphism are defined by absolute ages.The results suggest that the present-day global tectonic scheme was operative in the distant past as well.plate tectonics has had a profound impact on the scientific understanding of our dynamic planet.

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