Which of the following is a method used to obtain the relative age of a rock or fossil? a. Isotope calculations b. Original horizontality c. Radiometric dating d. Radioactive decay rates
"Radiometric dating" is the one among the following choices given in the question that is a method used to obtain the relative age of a rock or fossil. The correct option among all the options that are given in the question is the third option or option "c". I hope that the answer has come to your help.