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https://www.sciencelearn.org.nz/resources/1486-absolute-dating

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scientists identify isotopes to tell the exact age

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chemical elements break down over time into new isotopes

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looking at the radioactive materials in the rocks to determine the exact age

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https://www.sciencelearn.org.nz/resources/1485-relative-dating

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using biostratigraphy, we can tell the time periods the rocks and fossils were from

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looking at the order in which fossils appeared and disappeared through time and rocks

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The oldest is usually towards the bottom

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using stratigraphy, we can tell that the age of the rock from oldest to youngest is: E, C, B, D, then A

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looking at the position of rocks or fossils to tell which is older and younger

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a definite age of the rock or fossil

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not a numerical number, an estimated guess