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Students will work/complete worksheet in class.
Worksheet Answer Key:
To find the specific age of an object.
Isotopes.
Stable
Unstable
Radioactive Decay
By using Radiometric dating, which looks at the porportion of two different isotopes in a sample.
A radioisotope
Chemical isotope
Older
Half-Time
RadioMetric dating
Youtube Video:
Questions to check for students understanding:
How do you date the Earth?
Answer: Radiometric dating
How do we know the Earth is 4.6 billion years old?
Answer: This age has been obtained from the isotopic analysis of many meteorites as well as of soil and rock samples from the Moon by such dating methods as rubidium–strontium and uranium–lead.
Why is it important to date the Earth?
Answer: Earth's age is relevant to biology because an old Earth is necessary for macroevolution to occur and also because some dating methods (e.g., dendrochronology, varves) use materials of biological origin.
How old is the oldest planet?
Answer: 13 Billion years old.
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