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Learners make a refrigerator that works without electricity. The pot-in-pot refrigerator works by evaporation: a layer of sand is placed between two terra cotta pots and thoroughly soaked with water.

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 work in pairs to design, construct, and test a device that exhibits positive, neutral, and negative buoyancy. They test a number of different objects in water to see if they sink or float.

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

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

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

Learners use a candle to investigate the products of combustion. When a glass rod is held over a lit candle, the candle flame deposits carbon on the rod.

Learners create a small explosion by collecting hydrogen and oxygen gas together and squeezing them into a flame.

In this activity about dinosaurs and survival, learners use scrap materials to create a miniature dinosaur habitat that includes a food source, water source, and shelter.

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

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

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