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21-Feb-2017 04:17

Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.After all, the scientists haven’t been around that long, have they?There are a variety of different ways to figure out how old an object is.Unlike people, you can’t really guess the age of a rock from looking at it.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 its diamond allotrope, carbon is the hardest known substance in nature.

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By measuring the amount of carbon-14 left in the organism, it's possible to work out how old it is.One of the key characteristics of carbon is its ability to make long chains of molecules through linking up with other carbon atoms. It is a major element in many rock formations such as limestone and marble.



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