Tree rings (IMAGE)

GFZ Helmholtz-Zentrum für Geoforschung

Tree rings

Caption

Tree rings allow precise dating centuries into the past: The isotope ratios of carbon 13C to 12C and oxygen 18O to 16O in the cellulose of the tree trunk are indicators of drought or moisture at the time of tree growth.

Credit

G. Helle/GFZ

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None

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