One method of determining relative ages of rock.

To establish the age of a rock or a fossil, researchers use some type of clock to determine the date it was formed. Geologists commonly use radiometric dating methods, based on the natural radioactive decay of certain elements such as potassium and carbon, as reliable clocks to date ancient events.

Explanation:

just read the comments, or C

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answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;