Worksheet

Investigation: Tree Cookies

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About:

This hands-on earth science worksheet guides students in grades 6–8 through a five-part investigation of tree cookies. Students observe the cross-section of a tree, count annual rings to determine age, interpret ring width to infer growing conditions, and look for marks or scars that reveal environmental history. Includes prompts on heartwood, sapwood, and dendrochronology, and asks students to theorize what the tree experienced during its life.

Subject:: Science
Topic:: Earth Science
Grade Level:: 6th – 8th Grades
Updated March 2026

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