Potassium argon dating
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Argon-argon (or 40Ar/39Ar) dating is a radiometric dating method invented to supersede potassium-argon (K/Ar) dating in accuracy.
The older method required two samples for dating while the newer method requires only one.
Whenever the worldview of evolution is questioned, this topic always comes up.
Let me first explain how carbon dating works and then show you the assumptions it is based on.
Radiation from the sun strikes the atmosphere of the earth all day long.