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Example: dating the tree rings of a beam from a ruin in the American Southwest to determine when it was built.The science that uses tree rings to study present climate and reconstruct past climate.Example: analyzing ring widths of trees to determine how much rainfall fell per year long before weather records were kept.The science that uses tree rings to study factors that affect the earth's ecosystems.By matching ring-width patterns in a specimen of known age (starting with living specimens) to ring-width patterns in an older specimen, the proper placement of the older specimen is determined.Tree-ring chronologies have been extended to 10,000 years before present in this way.Generally, it is not possible to construct a complete sequence of tree rings back through the historical periods using only living trees.Chronologies derived from living trees must be extended.

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However, just counting the rings may lead to an inaccurate result, because of seasonal variations in ring growth and malformations.Trees continally grow outward during their lifespan by surrounding the central, live section with dead cells, or bark.However, trees grow faster in summer and slower in winter, causing 'tree rings' of different growth rates to form.(den-droh-cruh-NOL-uh-gee) means “the study of tree time.” Usually called tree-ring dating, dendrochronology is a science based on the fact that every growth season a tree adds a new layer of wood to its trunk.Over time, these yearly growth layers form a series of light and dark concentric circles, or tree rings, that are visible on cross sections of felled trees.




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We also know Secretary Kerry was being truthful in that media-hidden, albeit recorded, admission because CTH specifically tracked and investigated the CIA weapons shipments as an accidential outcome of the finalized Benghazi Briefing material in 2013/2014.


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