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Learners gain an intuitive knowledge of the physical aspects of watersheds by creating their own watershed models.

In this astrobiology activity (on page 11 of the PDF), learners consider what organisms need in order to live (water, nutrients, and energy).

In this activity, learners model ancient lunar impacts using water balloons.

In this activity, learners create channel features with flowing water, comparing their observations to real images of Mars and Earth taken by satellites/orbiters.

In this activity with several mini experiments, learners explore the chemistry that helps scientists learn about the environment and how they can help save it.

In this activity, learners model how the Moon's volcanic period reshaped its earlier features.