Relative age dating of rocks
Relative dating is used to determine the relative order of past events by comparing the age of one object to another. This determines where in a timescale the object fits without finding its specific age; for example you could say you're older than your sister which tells us the order of your birth but we don't know what age either of you are. There are a few methods of relative dating, one of these methods is by studying the stratigraphy. Stratigraphy is the study of the order of the layers of rocks and where they fit in the geological timescale.
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1. Relative age dating
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Absolute age dating — 3. Geological time scale — 4. Geological maps. It may surprise you to learn that geologists were able to determine much of the history of the Earth and its life without knowing anything about the actual ages of the rocks that they studied. Through use of absolute age dating techniques which were developed during the 20th century; see Section 2 , they were able to later assign dates in years before the preset to important events in Earth's history. But, before that, they relied upon a different approach to first determine the sequence of important events in Earth's past:
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This page has been archived and is no longer updated. Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4. Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.
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