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It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).By comparing the proportion of K-40 to Ar-40 in a sample of volcanic rock, and knowing the decay rate of K-40, the date that the rock formed can be determined.change water when the water changes colour...e.g if you soak DW, your water will become yellowish...

If one of these protons is hit by a beta particle, it can be converted into a neutron.

Using relative dating the fossil is compared to something for which an age is already known.

For example if you have a fossil trilobite and it was found in the Wheeler Formation.

Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).

One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40).

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