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In this activity (on page 2 of PDF), learners mix oil and water. Then, they add soap and observe what changes! The activity demonstrates how oil and water don't mix, except when soap is added.

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

Learners add two dyes to mineral oil and water, and then compare their miscibility (how well they mix) in each.

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

Learners observe a bottle containing water and oil. They are invited to pick up the bottle and mix the contents together.

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

Learners design, build, and test models of "dragon boats" made from up to three milk cartons.

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.

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.