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In this activity on page 14 of the PDF (Rethinking the 3 R’s: It’s Easy to be Green), learners turn plain pieces of recycled plastic into shrunken works of art.

In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

In this activity, learners write invisible messages on goldenrod paper, and make the message appear and disappear using acids and bases.