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    These are: Bias - the correspondence between the mean forecast and mean observation. Grassotti, 1995: Distortion representation of forecast errors.

    Radioactive dating examples in present day

    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.

    Similarly, in geologic studies, vast quantities of information from widely spaced outcrops have to be integrated.

    Some method of correlating rock units must be found.

    radioactive dating examples in present day-28radioactive dating examples in present day-18radioactive dating examples in present day-33radioactive dating examples in present day-16

    To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.

    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.

    By contrast, crustal destruction occurs at the margins of two colliding continents, as, for example, where the subcontinent of India is moving north over Asia.

    Great uplift, accompanied by rapid erosion, is taking place and large sediment fans are being deposited in the Indian Ocean to the south.

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