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In this activity, learners separate materials based on their special properties to mimic the way recyclables are sorted at recycling centers.

In this activity on page 12 of the PDF (Rethinking the 3 R’s: It’s Easy to be Green), learners examine how recyclable materials are separated by various properties at recycling centers.

In this activity, learners experiment with surface tension using everyday household items such as strawberry baskets, paperclips, liquid dish soap, and pepper.

In this activity, learners build a hovercraft using a paper plate, cup, and simple motor.