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In this demonstration, learners compare the relative sizes and masses of scale models of the planets as represented by fruits and other foods.

Learners engage in close observation of falling objects. They determine it is the amount of air resistance, not the weight of an object, which determines how quickly an object falls.

In a class demonstration, learners observe a simple water cycle model to better understand its role in pollutant transport.

This three-part activity consists of an activity that groups of learners develop themselves, a given procedure, and an optional demonstration.