How can the age of rocks be determined by analyzing the radioactive isotopes they contain?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Biology Mcqsbiology-mcqs
Published
2 Aug 2024
Last updated
28 May 2026

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Explanation

The quantity of radioactive isotopes decreases over time due to radioactive decay. Therefore, older rock layers contain fewer radioactive isotopes than younger ones, making option B the correct choice.

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