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Earth history

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  • How do fossils help us understand Earth's history?
    They provide evidence of past life
  • What is relative dating?
    Ordering geological events without knowing their exact age.
  • What is absolute dating?
    A method that gives the exact age of a rock.
  • What is the principle of superposition?
    The idea that lower rock layers are older than upper layers.
  • What is the name of the unit we are about to start?
    Diversity of life
  • Define Dendrochronology
    The study of tree rings to date events and environmental changes.
  • How do we know which rock layer is older?
    By the principle of superposition (the lower layer is older).
  • What is the half life of Carbon-14?
    5730 yrs
  • Absolute or Relative? Daniel is older than Paula
    Relative
  • Select the correct eon: * The whole Earth was hot and there were many volcanos.
    Hadean eon
  • The % of the parent isotope remaining after 3 Half Lives.
    12.5%
  • How does absolute age differ from relative age?
    only absolute dating finds the age in years
  • The original element that undergoes radioactive decay is known as the...
    parent element
  • What are the major stages of Earth's history?
    Eons, Eras, Periods
  • An element that has broken down and released particles and energy is said to be _______________.
    radioactive
  • The % of the parent isotope remaining after 1 Half Life.
    50%
  • How old is the Earth?
    Approximately 4.5 billion years.
  • If only 25% of carbon-14 remains, how many years old is the bone? (Carbon-14 half-life: 5730 years)
    11,460
  • What is a fossil?
    Preserved remains or traces of ancient organisms.
  • The element that is the product of radioactive decay is known as the...
    daughter element
  • Absolute or relative? The first book was published in IV a.c.
    Absolute
  • The % of the parent isotope remaining after 2 Half Lives.
    25%
  • The length of time required for half of the radioactive atoms in a sample to decay is its...
    Half-Life
  • If you see a diagram that shows the change from carbon-14 to nitrogen-14, what is the correct term for this process?
    radioactive decay
  • What do we call the breakdown of a radioactive isotope into a stable isotope?
    radioactive decay
  • What is an atom?
    The basic unit of matter.
  • What type of rock is best to use for radiometric dating?
    igneous rock
  • What is radiometric dating?
    A technique that uses isotopes
  • What are isotopes?
    Atoms of the same element with different numbers of neutrons.
  • Establish the correct sequence of the four eons of the Earth's history.
    Hadean eon, Archean eon, Proterozoic eon, Phanerozoic eon.
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