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In certain latitudes the tree’s ring growth correlates with moisture, but in others it may be correlated with temperature.

Periodic eruptions of Mount Hekla in Iceland have been of use in Scandinavia, which lies downwind.dendrochronology) must be mentioned.Carbon-14 continues to accumulate in an organism’s tissues until it dies.The carbon-14 then undergoes radioactive decay to become nitrogen, with a half-life of 5,730 years.This carbon isotope is generated when neutrons produced by collisions between cosmic rays and atoms in the upper atmosphere are captured by nitrogen atoms.Living tissue absorbs small amounts of carbon-14 through respiration and food ingestion.

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