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A sample of moon rock was brought back from the latest moon mission. Scientists are eager to date this rock to see when it was formed. They will use a technique called radiometric dating. Their data is shown below. Help the scientists calculate and draw conclusions about each sample.
Potassium-40 decays into Argon-40, known as K-Ar dating. Potassium-40 has a half-life of 1.25 billion years.

Identify the number of half-lives passed after 3.75 billion years.
Explain how you came to this conclusion.
Data
Number of half-lives Age of Rock
0 0 years
1 1.25 billion years
2 ?
3 ?
4 ?
5 ?

Sagot :

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