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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 Bob the Builder(TM)-themed activity, learners explore the 3Rs (Reduce, Reuse, Recycle) by rotating through several activity stations.

In this activity, learners collect, categorize, weigh and analyze classroom trash and discuss ways that engineers have helped to reduce solid waste.

In this activity on page 11 of the PDF, learners follow simple steps to recycle old newspaper into new paper.

In this activity with several mini experiments, learners explore the chemistry that helps scientists learn about the environment and how they can help save it.

In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.