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What's So Special about Water: Absorption
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In this activity about water's cohesive and adhesive properties and why water molecules are attracted to each other, learners test if objects repel or absorb water.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-604.jpg?itok=r7Od32Y0)
Shoe Dichotomous Key
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In this activity (on page 2 of the PDF under GPS: Cactus Activity), learners will develop their own version of a tool used by biologists, a dichotomous key, by collecting all their left shoes.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-957.jpg?itok=tIFoqkQV)
Sort It Out!
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In this activity, learners explore how engineers have developed sorting systems which integrate into manufacturing and packaging processes. Learners explore how coins are made.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-402.jpg?itok=VdFL1_8B)
Life in the Sidewalk Cracks
Source Institutions
In this activity, learners compare plant and animal life in different habitats including a sidewalk crack and lawn. Learners sort human-made materials and natural materials found in each habitat.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-004-388.jpg?itok=unfoQNRe)
Trash Talkin'
In this activity, learners collect, categorize, weigh and analyze classroom trash and discuss ways that engineers have helped to reduce solid waste.