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.
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.