⚙️ how
How do geologists date rocks using radioactive decay?
Quick Answer
They measure parent and daughter isotopes in minerals and use known half-lives to calculate how long decay has been happening.
The Full Story
Radiometric dating works because unstable isotopes decay at predictable rates. A mineral can trap radioactive atoms when it forms, and from that point the clock starts ticking. By comparing the amount of parent isotope left with the amount of daughter product, scientists can estimate an age. Different isotope systems are useful for different materials, such as uranium-lead for ancient zircon crystals or carbon-14 for recent organic remains up to about 50,000 years old.
Key Facts
1.Radioactive isotopes decay with known half-lives
2.Carbon-14 is useful for samples up to about 50,000 years old
3.Uranium-lead dating is used for very ancient rocks
YouTube Angle
Suggested video title for this topic:
"The atomic clock hidden inside rocks"
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