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In this environmental activity (page 6 of the PDF), learners identify household products that are recyclable and explore the different types of recyclable plastics.

free Ages 8 - 14 30 to 45 minutes
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Heat makes some materials expand, and it makes others shrink.

1 cent - $1 per student Ages 4 - 11 30 to 45 minutes
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In this activity, learners make bridges using an oil-based modeling clay (plasticene). The instructions include discussion questions for both before and after bridge building.

$1 - $5 per group Ages 4 - 11 30 to 45 minutes