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Very often historical evidence is found in layers and older layers are further down that the top layers.

For example: If an archaeologist is studying past civilizations, the archaeologist may be able to say that in a particular location the ruins of one civilization were found to have been built on another and so the layers unearthed in an excavation convey the sequence of historical occupations without revealing the actual dates.

Scientists measure the proportion of carbon-14 left in the organism to determine its age.

Our planet inherits a large number of artifacts and monuments bestowed upon us by older historic civilizations.

Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods.

Relative dating uses observation of location within rock layers, while radiometric dating uses data from the decay of radioactive substances within an object.

These remains are subjected to dating techniques in order to predict their ages and trace their history.

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Absolute dating, also called numerical dating, arranges the historical remains in order of their ages.There are several different methods that are used in relative dating.

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