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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.

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.

In this chemistry demonstration, acid rain is simulated in a petri dish.

This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.