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The Concepts: Children will use their sense of smell to sniff cross sections of evergreen trees. You can use donated Christmas trees, with trunks cut into 1- to 2-inch sections, or you can buy the tree blocks online. Students will put things in order from smallest to largest, use a hand lens to get a closer look at the rings of the trees, and use a tape measure to determine the distance across tree blocks and the height of their structures. The concept of recycling can also be introduced in this lesson.

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Check out the video for this activity here.