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Contact: Kevin Krajick
The Earth Institute at Columbia University

Neil Pederson, Lamont-Doherty Earth Observatory

Caption: Annual tree rings vary in relation to moisture and temperature, and can be read like a book. Study co-leader Neil Pederson of Lamont-Doherty Earth Observatory takes a cross section from a dead tree that may be well over 1,000 years old.

Credit: Kevin Krajick/Earth Institute, Columbia University

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