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In this activity (on page 2 of PDF), learners create a low-tech refrigerator that requires no electricity to keep food from spoiling.

In a class demonstration, learners observe a simple water cycle model to better understand its role in pollutant transport.

In this activity, learners apply a dissolving test to known crystals to identify the unknown. Since the unknown is chemically the same as one of the known crystals, it should dissolve similarly.

This activity shows you how to make amazing crystal spikes using Epsom salt and the sun.