Ppt 12.3 earth
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Ppt 12.3 earth

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Ppt 12.3 earth Ppt 12.3 earth Presentation Transcript

  • Earth Science
    Dating with Radioactivity 12.3
  • Radioactivity
    The spontaneous decay of certain unstable atomic nuclei.
  • Half-life
    The time required for one half of the atoms of a radioactive substance to decay.
  • Radiometric Dating
    The procedure of calculating the absolute ages of rocks and minerals that contain radioactive isotopes.
  • Radiocarbon Dating
    Method for determining age by comparing the amount of carbon-14 to the amount of carbon-12 in a sample
  • What is Radioactivity?
    When nuclei are unstable, they spontaneously break apart, or decay, in a process called radioactivity.
  • What is half-life?
    A half-life is the amount of time necessary for one half of the nuclei in a sample to decay to its stable isotope.
  • What is radiometric dating?
    An accurate radiometric date can be obtained only if the mineral remained in a closed system during the entire period since its formation.
  • How is carbon-14 used in radiometric dating?
    When an organism dies, the amount of carbon-14 gradually decreases as it decays. By comparing the ratio of carbon-14 to carbon-12 in a sample, radiocarbon dates can be determined.