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Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it.

This quiz lets you estimate your annual radiation exposure.

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

Learners add acid rain (nitric acid) to two cups that represent lakes. One cup contains limestone gravel and the other contains granite gravel.

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

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

In this experiment, learners design and build a model room in a shoebox and furnish it with tiny furniture.