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Longitudinal vibrations through the air are perceived by us as sounds.

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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    by Henrik Malmberg //at grade

    Students will learn how sound is produced and how it travels through the air to then register a signal in the brain.

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