 Argon is abundant on Earth's atmosphere because it comes from the decay of Potassium-40 (source code)

by Ciro Santilli (@cirosantilli, 37)

= Argon is abundant on Earth's atmosphere because it comes from the decay of Potassium-40

And notably, it is almost all <Argon-40>, which is stable, but not the most common one to come from natural <#nucleosynthesis>.

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