accommodating hearing impaired - Relative age dating of rocks

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.

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

The two approaches are often complementary, as when a sequence of occurrences in one context can be correlated with an absolute chronlogy elsewhere.

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.

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.

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

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