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Did you know that a Slinky makes a handy model of earthquake waves?

In this design challenge activity, learners build a four-stringed instrument that can play a tune.

In this activity (Lesson 1), learners work in groups to create tide simulations.

This lesson (on pages 15-24 of PDF) explores how sound is caused by vibrating objects. It explains that we hear by feeling vibrations passing through the air.