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8 December, 11:22

Explain how radioistopes are used to determine the age of a rock

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  1. 8 December, 11:45
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    This is Ar/Ar dating, (carbon dating is for living organisms). When Ar is expelled from the earth, it starts off as a specific radioactive isotope of argon. The argon will break down and form other Ar isotopes at a set rate known as a half-life. The concentration of the isotopes is used to determine the age of the rock.
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