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

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

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

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