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In this design challenge, learners use their creativity and imagination to design and test a wildlife crossing for their favorite animal.

Learners compare the weight of equal volumes of wax, water, and clay. Learners discover that since the wax weighs less than an equal volume of water, it is less dense than water and will float.

In this indoor or outdoor water activity, learners pour water from small cups to large cups and containers. In doing so, they discover water takes the shape of its container.

In this activity, learners will create their own lava lamps. Learners will explore density, effervescence and chemistry through this activity.

This activity attempts to clear up the common misconception that deserts are always hot, totally dry, and uninhabitable.

In this activity, learners build their your own seismograph with household materials to document shaking.

In this activity (located on page 2), learners will construct tiny model geysers out of film canisters, warm water, and antacid seltzer tablets.

In this activity (on pages 11-12 of PDF) learners create models of lava layers that have formed on the moon.

In this yummy activity about soil (page 9 of PDF), learners will create layers of soil using food. They will learn about the composition and role of each layer.

In this activity, learners explore the Great Plains.

In this activity, learners will turn an ordinary tray of sand into a desk-top garden for meditation.

Learners use simple materials to construct a model the Big Dipper. Learners hang the model from a doorway or ceiling and look up at it to see the constellation as seen from Earth.

In this activity, learners explore the relative sizes and distances of objects in the solar system.

In this activity, learners use maps to locate the Arctic region and use a word game to discover the types of resource people need to survive in the extreme climate.