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In this activity, learners build models of atoms and molecules, then consider their role in different phases of matter, density, and mixtures and solutions.

In this activity, learners explore the function and engineering of dams and how dams have many uses and solve many problems in the world.

Learners create a model of a wetland to observe how it absorbs and filters water from the environment.

In this activity, learners explore the different heating properties of soil and water.

In this experiment, learners try different liquids to see which ones clean pennies best. Liquids to try include water, lemon juice, cola, vinegar, and dishwashing detergent.

In this activity related to flight, learners build a tiny stream channel to investigate how fluids (air and water) change speed as they flow between and around objects.

Build a hydrometer (measures the density of a liquid) using a pipet or eyedropper.

In this outdoor activity, learners race small boats, made of cork, balsa wood, popsicle sticks etc., to investigate the rate and direction of currents in a stream or creek.

In this multi-part activity learners examine non-point water pollution.

In this chemistry challenge, learners discover that many chemical reactions involve heat loss or gain.

In this activity, learners observe how salinity affects the freezing point of water by making and enjoying ice cream.

Learners place water and part of an antacid tablet in a film canister. The reaction creates a gas reaction that launches the film canister like a rocket.

This hands-on experiment will provide learners with an understanding of the issues that surround environmental cleanup.

In this optics activity, learners explore how light bends and affects what we see.

In the kitchen, learners can perform their own density investigation.

In this optics activity, learners use water to make a coin "appear" and "disappear." Use this activity to demonstrate how light refracts and introduce light as waves.

In this activity, learners investigate the properties of plastic bags. Learners find out what happens when they slowly push a pencil through a plastic bag filled with water.

In this activity about magnetism (page 13 of the pdf), learners will experiment with magnets to explore how water and other liquids affect the strength of magnetic fields.

Ocean acidification is a problem that humans will have to deal with as we release more and more carbon dioxide into the atmosphere.

In this activity, learners will explore globes of frozen water to learn how to ask and then answer 'investigable' questions. The activity web page includes a short video demonstration.