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Age of Earth loading

Scientists have tried to determine Earth's age in various ways over time; we now know that Earth is about 4.6 billion years old.

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Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
  • Read
    Age of Earth

    Age of Earth

    by CK-12 //basic
    How scientists have been able to determine the age of Earth.
    MEMORY METER
    This indicates how strong in your memory this concept is
  • Video
    4.6 Billion Years in the Making: Our Wonderful World

    4.6 Billion Years in the Making: Our Wonderful World

    by CK-12 //basic
    4.6 billion years in the history of the planet. That's an amazingly long time. This video will help you put that into perspective.
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    This indicates how strong in your memory this concept is
  • Downloadable Quiz
    Age of Earth Quiz - MS ES

    Age of Earth Quiz - MS ES

    by CK-12 //basic
    Reviews how scientists have been able to determine the age of Earth and major events along the geologic time scale.
    MEMORY METER
    This indicates how strong in your memory this concept is
  • Real World Application
    Discovering Earth's Age

    Discovering Earth's Age

    by CK-12 //basic
    Bertram Boltwood first used radiometric dating to determine the ages of rocks and of Earth. Although his calculations were not completely accurate, he brought in an important new source of scientific information to the field of geology.
    MEMORY METER
    This indicates how strong in your memory this concept is
  • Real World Application
    Date a Planet

    Date a Planet

    by CK-12 //basic
    Discover how scientists use radiometric dating to determine the age of Earth.
    MEMORY METER
    This indicates how strong in your memory this concept is
  • Real World Application
    The Answer is Convection

    The Answer is Convection

    by CK-12 //basic
    Reviews how Lord Kelvin calculated Earth's age and why his result was much too young.
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