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Development of Theories

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Levels are CK-12's student achievement levels.
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.
  • Real World Application
    Discovering the Keeling Curve

    Discovering the Keeling Curve

    by David Carmichael //basic

    Charles David Keeling began measuring atmospheric carbon dioxide levels on top of Mauna Loa volcano in 1958. These data are extremely valuable in showing how fossil fuel burning is adding carbon to the atmosphere.

  • Real World Application
    A Gigantic Experiment

    A Gigantic Experiment

    by David Carmichael //basic

    Atmospheric carbon dioxide levels reach 400 ppm and no one knows what the outcome of this experiment will be.

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