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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.

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.

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

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.

Learners observe a flask with a balloon attached over the mouth and inverted inside the flask.