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

Learners build models to learn about the special cells and structures that plants use to move water from their roots up through the stems and leaves.

Learners build models of sinkholes to gain an intuitive knowledge of their physical aspects.

In this activity (on page 2 of the PDF), learners explore surface tension by adding pennies to cups which are "full" of plain water or soapy water.

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

Learners will explore the scientific mystery behind a disappearing group of trees by examining data and attempting to explain the decline.