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Write the name of each layer What is an important property of that layer?

Write the name of each layer What is an important property of that layer?. Absolute Time. Radiometric or Isotopic dating Tells an “exact” age Radioactive decay Parent nucleus becomes more stable daughter nuclei Give off energy Constant rate Half-life 100g → 50g + 50g → 75g + 25g.

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Write the name of each layer What is an important property of that layer?

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  1. Write the name of each layer • What is an important property of that layer?

  2. Absolute Time • Radiometric or Isotopic dating • Tells an “exact” age • Radioactive decay • Parent nucleus becomes more stable daughter nuclei • Give off energy • Constant rate • Half-life • 100g → 50g + 50g • → 75g + 25g

  3. % parent left = # of half-lives → age • What do we use? • Carbon-14 • Uranium-235 • Potassium-40

  4. Carbon Dating • Various forms of carbon • Most common = carbon-12 • Radioactive = carbon-14 • Carbon-14 • Used for things that were alive • During life - constantly replaced • After death - amount starts to decrease • Half-life of 5,730 years

  5. You are a CSI Detective… • You found a skeleton contains 12.5% of it’s original carbon. • How many half lives have passed? • How old is it? (how long ago did this person die?)

  6. You are an anthropologist and found this animal! • This skeleton contains 3.125% of it’s original carbon. • How many half lives have passed? • How old is it?

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