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This guide outlines how to plant a garden even if you don't have a yard!

This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates.

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

In this activity (on pages 19-24 of PDF), learners soak chicken bones or eggshells in vinegar for several days.