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Activity
NOAA

Noaa: Be a Tree Ring Detective [Pdf]

For Students 3rd - 8th
Discover the reason why trees have rings. Then use your skills of inquiry to decide which tree samples are the oldest, based on their rings.
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Lesson Plan
PBS

Pbs Teachers: Methuselah Tree

For Teachers 9th - 10th
Examine how scientists determine the age of living and non-living trees and identify factors that impact sizes of tree rings. Analyze tree ring samples and determine the age of the oldest sample.