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Short Answer: Radiometric dating is one type of method used in absolute dating.

Relative dating simply says one is older than the other but no age is specified.

Tools in the category of radiometric dating are based on the known rates of radioactive decay of isotopes and this allow some samples to be assigned a certain age to within some accuracy.

Radiometric techniques are one method of absolute dating and, for example, counting tree rings is another form of absolute dating.

Any technique that assigns a certain age or date is a form of absolute dating.

Relative dating is any scientific process of evaluation used to determine the relative order of past events, but does not determine the absolute age of an object.

Long Answer: Sciences such as geology, paleontology and archeology are very interested in identifying the age of objects found and these scientists sometimes use either relative dating or absolute dating to characterize the age of the objects they study.Before radiometric dating it was difficult to determine the actual age of an object.Radiometric dating, based on known rates of decay of radioactive isotopes in objects, allows a specific age of an object to be determined to some degree of accuracy.Relative dating is a scientific process of evaluation used to determine the relative order of past events, but does not determine the absolute age of an object.The circumstances of the object may allow one to say that one object is older than another without being able to assign a particular age to the objects.For example: If an archaeologist is studying past civilizations, the archaeologist may be able to say that in a particular location the ruins of once civilization were found to have been build on another and so the layers unearthed in an excavation convey the sequence of historical occupations without revealing the actual dates.

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