These engaging lessons (GOOGLE and PDF versions) give students a concrete understanding of how we generate sounds, the frequencies that we can hear compared to different animals, the fact that sound waves need a medium to travel through, and the differences between sound traveling through solids, liquids, and gasses.These lessons support the NGSS standard MS PS4-2These lessons are launched with an anchor phenomenon which is revisited at the end of the unit. An explanation of the phenomenon is g