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Radioactive dating ppt

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Yet, you’ve heard the news: Earth is 4.6 billion years old. That corn cob found in an ancient Native American fire pit is 1,000 years old. Geologic age dating—assigning an age to materials—is an entire discipline of its own.In a way this field, called geochronology, is some of the purest detective work earth scientists do.

What’s more, if the whole rock is badly weathered, it will be hard to find an intact mineral grain containing radioactive isotopes.There are two basic approaches: relative age dating, and absolute age dating.Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.Hence, in an atom the atomic number is also equal to the number of electrons.All atoms have a certain value of mass number which is derived as follows.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.