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A series of measured tree-ring properties, such as tree-ring width or maximum latewood density, that has been converted to dimensionless indices through the process of standardization.A tree-ring chronology therefore represents departures of growth for any one year compared to average growth.One is Relative Dating, and the other is Absolute Dating.In general, archaeologists use both methods in conjunction.The science that uses tree rings to study factors that affect the earth's ecosystems.Example: analyzing the effects of air pollution on tree growth by studying changes in ring widths over time.Usually this process tries to remove the growth trends due to normal physiological aging processes and changes in the surrounding forest community.An auger-like instrument with a hollow shaft that is screwed into the trunk of a tree, and from which an increment core (or tree core) is extracted using an extractor (a long spoon inserted into the shaft that pulls out the tree core).

In fact, the introduction of "divergence" into the dendro-lexicon in the late 1990s epitomized the changing response of trees to climate over time, first scrutinized in detail in the mid-1980s. Perhaps it actually "Paradoxically, in suggesting that this term now be dropped from use, we pay a most fitting tribute to its vital role in the history of geology." -- Stephen Jay Gould, 1965, "Is uniformitarianism necessary"?The science that uses tree rings to date and study the past dynamics of insect populations.Example: dating the growth suppressions left in tree rings from western spruce budworm outbreaks in the past.The science that uses tree rings to date when timber was felled, transported, processed, or used for construction or wooden artifacts.Example: dating the tree rings of a beam from a ruin in the American Southwest to determine when it was built.

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