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In this Energy and Environment activity (page 9 of the PDF), learners calculate the mass of a piece of gum, compare it to the mass of the gum's packaging, and then create a bar graph of the results.

In this activity, learners conduct a waste audit and use their findings to implement a plan for reducing trash.

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, learners make cool boxes out of old (or new) greeting cards or postcards.

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