Tree dating definition

The science that uses tree rings to date and study past and present changes in glaciers.This is a cross-section of a Douglas-fir (Pseudotsuga menziesii) from the Catalina Mountains north of Tucson, Arizona.They are the lungs of the world, breathing in carbon dioxide and breathing out the oxygen on which animal life depends.They live in all sorts of conditions too: in temperate and tropical areas and in arid locations, from mountain landscapes to the rainforests of the equator and the temperate uplands of Scandinavia, they are everywhere.

The practical applications of the study of tree rings are numerous.The science that uses tree rings to study factors that affect the earth's ecosystems.Example: analyzing the effects of air pollution on tree growth by studying changes in ring widths over time.Douglas-fir is one of the preferred species for dendrochronology in the western portions of North America.The species has exceptional circuit uniformity, meaning that the rings are usually concentric around the middle.

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