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Water and Life

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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
    How Much Water is There?

    How Much Water is There?

    by CK-12 //basic

    The total amount of water above, on and in Earth is not very much. Since most of this water is not usable, the usable parts must be taken care of.

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