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What do scientists assume to be true when calculating the absolute ages of rocks? Is their assumption a valid one?

What do scientists assume to be true when calculating the absolute ages of rocks? Is their assumption a valid one?
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what do scientists assume to be true when calculating the absolute ages of rocks? Is their assumption a valid one?

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User Asken
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Answer: They are assuming that only the unstable isotope of an element was present when the rocks were first formed. There is no way to know for sure because no one observed it.

Hope that helps! Have a good day :)
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User Junmats
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