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

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

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

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

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

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

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

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

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

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

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

What are some limitations to Dendrochronology?

What are three benefits?

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

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

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

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

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

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).

What is Uranium 235s Daughter isotope?

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

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

My so called half-life

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

Compare Uranium 235 dating to Radiocarbon dating.

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

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

Are the magnetic field reversals Relative or Absolute Dating?

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