I have a 2.5 billion-year-old rock. When it formed, it didn’…
I have a 2.5 billion-year-old rock. When it formed, it didn’t have any Argon-40, but it contained Potassium-40. What is the ratio of Argon-40:Potassium-40 in it today, if I were to measure it in the lab? (Use the figure below to work out your answer, you will not need to perform a calculation).
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