Tree ring dating definition
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Drought or a severe winter can cause narrower rings.If the rings are a consistent width throughout the tree, the climate was the same year after year.By counting the rings of a tree, we can pretty accurately determine the age and health of the tree and the growing season of each year.Modern dendrochronologists seldom cut down a tree to analyze its rings.
Instead, core samples are extracted using a borer that's screwed into the tree and pulled out, bringing with it a straw-size sample of wood about 4 millimeters in diameter.
The hole in the tree is then sealed to prevent disease.