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Besides dating trees and revealing past climate data, dendrochronology is used to provide information about glacial activity, volcanic events, and even past insect outbreaks. Majestic Trees of America Timeline Trees Highlights some tree-related milestones from 2000 b.c., around when the oldest living tree was born, to 2001 a.d., the year America voted for a National Tree.

You may want to tell students that scientists rarely cut down the trees they research. Ultimate Tree-Ring Web Pages Provides comprehensive information about dendrochronology and links to a wide range of dendrochronology resources.

Tree growth depends upon local conditions such as water availability.

Because the amount of water available to the tree varies from year to year, scientists can use tree-ring patterns to reconstruct regional patterns of drought and climatic change.

Computer analysis and other methods have allowed scientists to better understand certain large-scale climatic changes that have occurred in past centuries.