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It wasn't until well into the 20th century that enough information had accumulated about the rate of radioactive decay that the age of rocks and fossils in number of years could be determined through radiometric age dating.This activity on determining age of rocks and fossils is intended for 8th or 9th grade students.An isotope is a particular type of atom of a chemical element, which differs from other isotopes of that element.The different numbers of neutrons possible in the atoms of a given element correspond to the different possible isotopes of that element. Carbon-12 is the isotope of carbon that has 6 neutrons.Carbon-13 is the isotope of carbon that has 7 neutrons.

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This cartoon of the Grand Canyon shows the names of individual layers.Determining the when this building was built is very easy -- you just read it off of the cornerstone.Many important buildings for government, schools, and churches have a cornerstone showing the year of construction.Along the left side, it also gives the approximate age of each layer in millions of years.In order to determine the age of an individual layer, a geologist must collect a sample of that layer and take it back to the lab.

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