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This activity explores the basic workings of a siphon, which is the core technology that makes toilets work.

In this activity, learners will model the mechanical weathering and erosion of rocks in a stream or river.

This online simulation game explores the different consequences of water levels on the Columbia River in the Pacific Northwest.

In this activity (on page 2), one person "programs" the other like a robot to move through a space, trying to get them to avoid obstacles and reach a goal.