Compléter 135-testVersion en ligne 135-test par Farhad Key 1 drought that series past that reflect season series A bonus of dendrochronology is the width and substructure of each ring the amount of rain and the at which the rain fell during particular year . Thus , tree ring studies also allow one to reconstruct climate ; e . g . , a of wide rings means a wet period , and a of narrow rings means a .