Simple carbon dating explanation
I'm not sure what you intend on accomplishing by explaining this to them.
You should instead stick with the more general concept of RADIOMETRIC dating. Argon is a gas, but Potassium is a mineral that is mixed in with lava.
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So we know that 100% of all the Argon atoms in an igneous rock got there from decaying Potassium, after it solidified.
Furthermore we know the rate of decay of Potassium because the decay process gives off a charged particle.
But some Potassium isotopes will decay over time to Argon anyway.
That means Argon atoms which are normally just gaseous become trapped in solid igneous rock.
While most other dating mechanisms date the rock surrounding fossils, both Amino Acid and Carbon 14 dating methods, date the actual fossil itself.
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