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In this activity, learners build one or more edible coral polyps and place them together to form a colony.

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

In this ecology activity, learners make a model water-based ecosystem called a terraqua column. The column (in a large soda bottle) includes pond water, duckweed, sand or gravel, and small snails.

In this activity, a group of learners work collaboratively to design and construct a paper model showing the evolution of an environment through multiple stages, from prehistory through the modern cit