Fossilized tree rings

Climate Change

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Trees store information about climatic conditions in the rings they lay down each year. Dendrochronology — the science of studying these rings — allows scientists to learn about the ancient climate on Earth.

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Each tree ring represents a year in the life of the tree. The youngest rings are the outer ones, closest to the bark. This bald cypress is estimated to have been about 700 years old when it was fossilized.

Credit:

James St. John, North Carolina Museum of Natural Sciences/Flickr

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