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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

In this four-part activity, learners explore light and sound through a variety of hands-on investigations.

Learners analyze mixtures of dyes using filter paper chromatography. They place spots of the different dyes at the bottom of a piece of filter paper, and hang the paper to touch the surface of water.