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File: climate-data-drill-wood-samples-dendrochronology-sampling-growth-ring.png

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Alternate Text: Tree slab with ruler, drill, and wood cores with annual growth lines
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Tree slab with ruler, drill, and wood cores with annual growth lines

Image caption

Tree-core drill and wood core samples next to a tree slab. Dendrochronologists (tree-time scientists) count the number of growth rings and record the pattern of their widths. The pattern of varying widths can be matched against those of other trees to determine their age. Photo by Hannes Grobe Creative Commons Attribution ShareAlike 2.5 (Generic).