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The mathematical formula can be used to determine exactly how many half-lives have elapsed, for any fraction of parent/daughter isotope, without having to make a visual estimate from a graph.

This activity on determining age of rocks and fossils is intended for 8th or 9th grade students.It is estimated to require four hours of class time, including approximately one hour total of occasional instruction and explanation from the teacher and two hours of group (team) and individual activities by the students, plus one hour of discussion among students within the working groups.Explore this link for additional information on the topics covered in this lesson: This activity will help students to have a better understanding of the basic principles used to determine the age of rocks and fossils. Objectives of this activity are: 1) To have students determine relative age of a geologically complex area.Far from being data, these dates are actually interpretations of the data.As discussed before, the assumptions influence the interpretation of the data.




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