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Learners follow a three-step process to start their own rock collection.

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

In this experiment using sprigs of Elodea, learners will observe a natural process that removes carbon dioxide (CO2) from Earth's atmosphere.

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

In this activity, learners use simple materials to build their own compass.

In this nighttime, outdoor activity, learners keep a record of what they see in the sky by drawing constellations, the Moon, and making note of the weather and conditions each day.

This activity helps learners understand how the angle of the Sun affects temperatures around the globe.

Using simple, inexpensive items, learners build and test submarine models.

Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide.

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 observe the moon each night for a month and draw their observations in a Moon Watch Log.

In this activity about camouflage, learners create a model that shows how a flounder is able to blend into a variety of environments.

This three-part activity shows learners how to build three meteorology tools: a wind vane, a rain gauge, and a barometer.