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In this crafty chemistry activity (on page 2 of the PDF), learners make their own paper from used paper they may have otherwise thrown away.

In this activity, learners explore how environmental engineers might approach solving the problem of an oil spill.

Learners design their own experiment to investigate how pollution diffuses through ground material.

Learners make a simple battery out of "sandwiches" of aluminum foil, pennies, and a salt water-soaked paper towel.