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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.
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    광선

    광선

    by Whakuk Lee //at grade

    가시광선, 적외선과 자외선

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    Light

    Light

    by Maria Cademartori //at grade

    Visible light and the different waves that make it up, infrared light and ultraviolet light.

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