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In this activity, learners simulate nature's water filtration system by devising a system that will filter out both visible and invisible pollutants from water.

Learners take on the role of environmental engineers as they design water filters.

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

In this activity about saturation (page 1 of PDF under SciGirls Activity: Sand Dunes), learners will build a series of sand castle towers using a 16 oz cup.

Learners work in groups to construct bridges using stale marshmallows and toothpicks.

In this activity (on page 5 of PDF), learners use dry ice and household materials to make scientifically accurate models of comets.