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Dating Notes I will be able to identify which methods are best for determining the ages of various materials

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Talk with your neighbor What might you want to Date in Earth Science? What are two ways of Dating things? I will be able to identify which methods are best for determining the ages of various materials

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Relative Dating You are identifying if something is older or younger than something else I will be able to identify which methods are best for determining the ages of various materials

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Stratigraphy I will be able to identify which methods are best for determining the ages of various materials

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What is older? B or C I will be able to identify which methods are best for determining the ages of various materials

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What is older? G or A I will be able to identify which methods are best for determining the ages of various materials

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What is Oldest? I will be able to identify which methods are best for determining the ages of various materials

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What is youngest? I will be able to identify which methods are best for determining the ages of various materials

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Fossil Evidence I will be able to identify which methods are best for determining the ages of various materials

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Absolute Dating Dendrochronology I will be able to identify which methods are best for determining the ages of various materials

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Dendrochronology I will be able to identify which methods are best for determining the ages of various materials

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What are some limitations to Dendrochronology?

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What are three benefits?

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Radiometeric Dating Use decay of radioactive isotopes Decay happens at predictable rate – Uranium 235 – Potassium/ Argon – Carbon Dating Radiometeric Dating video I will be able to identify which methods are best for determining the ages of various materials

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Review Atoms Nucleus composed of protons (p+) and Neutron (n 0 ) Electrons (e-) fly around nucleus in different energy levels Elements are decided by the number of protons an atom has. I will be able to identify which methods are best for determining the ages of various materials

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Atomic Symbol Atomic Number Number of Protons Number of Electrons (if Neutral) Atomic Weight (p + +n 0 ) I will be able to identify which methods are best for determining the ages of various materials

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CFU Find the number of protons, electrons, and neutrons for the following

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So why the decimal The atomic weight has a decimal because it is the average weight of all the naturally occurring isotopes. What is an Isotope? A different version of an element. Isotopes vary by the number of neutrons they possess. Ex: C-12, He-3, U-238 I will be able to identify which methods are best for determining the ages of various materials

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Radiometric Dating Radioactive Decay Half-life. The half life is the amount of time it takes for half of Isotopes to change from the original form (parent isotope) to the new form (daughter isotope).

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What is Uranium 235s Daughter isotope?

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I will be able to identify which methods are best for determining the ages of various materials

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Let us illustrate our idea Ex: Carbon-14 with a half-life of 5,730years (well call it 6,000)

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My so called half-life

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What things can you date with Radio Carbon Dating? I will be able to identify which methods are best for determining the ages of various materials

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Compare Uranium 235 dating to Radiocarbon dating.

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Potassium Argon 40 K decays into 40 Ca and 40 Ar Half life is 1.248×10 9

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Magnetic field Reversals Reversals in earths magnetic field trapped in lava flows at ocean ridges

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Are the magnetic field reversals Relative or Absolute Dating?

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7.2 Half-life.

7.2 Half-life.

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