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In this activity, learners discover the primary physical properties used to separate pure substances from mixtures.

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

This lesson challenges groups of learners to design and construct a wind generator with the most electrical output.

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.