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A bonus of dendrochronology is that the width and substructure of each ring reflectregistercovetcopy reflect the amount of rain and the timingdurationdivisionseason season at which the rain fell during that particular year. Thus, tree ring studies also allow one to reconstruct pastbeforepassthen past climate; e.g., a series of wide rings means a wet period, and a seamseriesserialseam series of narrow rings means a hardnesshumiditydroughtstrength drought .