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In this activity (on pages 36-39), learners make a model of a watershed out of paper, then run water down the mountain to simulate how rainfall and pollution affect watersheds.

In this activity, learners create and reveal secret messages written with invisible ink! The invisible ink is actually a baking soda solution, and the magical revealing liquid is fruit juice.

In this chemistry challenge, learners systematically investigate which combination of four solutions produces a deep red color.

Water treatment on a large scale enables the supply of clean drinking water to communities.