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In this activity, learners discover how frogs' bodies change while growing from a tadpole to a frog. Learners create a simple craft that gives a visual display of the metamorphosis process.

This investigation provides learners with a hands-on activity that simulates the changing relationship of surface areas-to-volume for a growing cell.

In this activity, learners create three-dimensional shapes by making some origami models of simple boxes and containers.

In this activity, learners make models representing bones on Earth and bones that have been in space. They discover what happens to bones without proper exercise and nutrition.

In this environmental education demonstration (page 6 of the PDF), learners will see a tangible representation of the scarcity of soil resources on earth.

In this activity, learners explore how casts of fossilized bones are created and used to learn about dinosaurs. Learners make observations, draw diagrams and share their findings.

In this activity, learners explore how salt water freezes in comparison to fresh water.

In this activity, learners explore why the sky is blue. Learners model the scattering of light by the atmosphere, which creates the blue sky and red sunset, using a flashlight and clear glue sticks.

In this activity, learners make their own edible DNA double helix out of candy and find out about the shape of DNA.

In this activity, learners simulate the process of DNA fingerprinting by using electricity to separate colored dyes.

In this activity, learners explore clouds and how they form.

In this activity (p.7-8 of PDF), learners examine fossil formation.

In this engineering activity (page 3 of PDF), young learners investigate how a pole can be made stable by “planting” its base in the ground or adding supports to the base.

In this design-based activity, learners explore environments, ecosystems, energy flow and organism interactions by creating a model biodome. Learners become engineers who create model ecosystems.

Many germs spread by our hands, and often times, people don't wash their hands well enough to get rid of germs.

In this activity, learners use information gathered from a variety of sources to design and make their own insect.

In this activity, learners make a miniature greenhouse or "terrarium" to explore the greenhouse effect.

In this activity (on page 8), learners model how marble statues and buildings are affected by acid rain.

In this activity, learners model directed evolution by making paper fly. Learners construct and fly paper airplanes.

In this simulation, learners explore how ocean currents spread all kinds of pollution—including oil spills, sewage, pesticides and factory waste—far beyond where the pollution originates.