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In this activity, learners create a mixture of water, alcohol and permanent marker ink, and then add salt to form a colored alcohol layer on top of a colorless water layer.

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.

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

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

In this activity, learners discover that there is space between molecules even in a cup "full" of water. They first fill a cup with marbles, and then add sand to fill the gaps between the marbles.

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.

In this activity, learners investigate the process of osmosis by adding salt to a sealed bag of raw carrots and comparing it to a control.

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 make a simple battery out of "sandwiches" of aluminum foil, pennies, and a salt water-soaked paper towel.

Learners work in groups to construct bridges using stale marshmallows and toothpicks.

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

This lesson (on pages 15-24 of PDF) explores how sound is caused by vibrating objects. It explains that we hear by feeling vibrations passing through the air.

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

In this activity, learners add dilute bleach solution to water that has been dyed with yellow, blue, and green food color.

In two separate bags, learners mix water with Epsom salts and detergent.

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