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Your welcome for helping you with Biology Homework.... Both are attempting to get information on the history of events.
Tools like radiometric dating use radioactive isotopes and known decay rates… relative is determining the relative order of past events, without necessarily determining their absolute age.
Absolute dating is a method of estimating the age of a rock sample in years via radiometric techniques.
Radioactive dating allows us to find an approximate date. Relative age 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 or date of an event.
So if something is dated about a thousand years ago plus or minus… Relative dating gives a relative answer -10 years after the end of the civil war. Both relative dating and absolute dating are complimentary tools tools used to assign temporal characteristics to a sequence of events.
The primary difference in relative dating and absolute dating is that absolute dating assigns an actual time or age to an event or object. Relative dating involves the dating of geological events and formations that occured/existed throughout the whole geological history, and this eventually gives the relative age of the earth.
While, Absolute dating involves the use of isotopes and radioctive elements (radioactivity) and also the study and relation of meteorites and moon rocks, which eventually gives the actual/absolute age of the earth.