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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

In this design-based activity, learners explore environments, ecosystems, energy flow and organism interactions by creating a model biodome. Learners become engineers who create model ecosystems.

Learners observe and discuss a simple model of a wet scrubber, a device for cleaning industrial air pollution.

Learners work in teams to design and build solar water heating devices that mimic those used in residences to capture energy in the form of solar radiation and convert it to thermal energy.