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In this design challenge, learners will engineer a structure and see if it can survive an earthquake they create.

In this activity, learners explore how the area of Arctic sea ice has changed over recent years. First, learners graph the area of Arctic sea ice over time from 1979 to 2007.

In this activity, learners explore the human influences on the carbon cycle and examine how fossil fuels release carbon.

This activity has three story puzzles learners can solve to learn about life in the Arctic.

Learners complete a series of hands-on and investigative activities to explore cumulus clouds.

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

In this activity about problem-solving, learners build a house for the Three Little Pigs using twenty straws and two index cards.

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

Learners draw comic-style pictures to show the water cycle. From a starting picture, one learner draws what happens to the water in the next panel, then passes the comic strip to another learner.

In this activity, learners construct a traditional handicraft toy that illustrates a motion commonly associated with violins and earthquakes.

In this activity, learners construct models of plants that are adapted to living under specific environmental conditions.

Learners will build and experiment with their own windmills made from simple household materials.

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

In this activity, learners create their own icons for a forecast-at-a-glance poster for their classroom/learning space.

In this family or group activity, learners create a nature journal by visiting a local nature center or backyard, observing creatures in their natural habitats, and sketching what they see.

In this activity, learners design and build a simple wind vane —one of the oldest kinds of weather tools— and use it to show wind direction.

In this activity, learners thread colored beads onto string. Each beach represent a process of the water cycle.

In this activity, learners make a flip book that shows the progression of two solar events on reversible sides of the flip book.