age of tree by counting the annual ring is dendrochronology.
age of tree by counting the annual ring is dendrochronology.
age of tree by counting the annual ring?
dendrochronology
dendrochronology is the science of dating and study of annual rings in trees. a tree in temperate and colder climates typically will grow one new ring every year, therefore the age of the tree can theoretically be determined by counting the number of rings present. the problem lies in the fact that some years, particularly in years of drought, a tree will not grow an annual ring. in other years where the growing season is interrupted a tree may grow a second false ring. the trees rings are commonly measured by taking a series of core samples. a borer is used to extract a pencil-size diameter or smaller core from a living tree or from a log. for downed and dead trees a disk section or "tree cookie" may also be taken, these are polished, the rings identified, and the number of rings and the distance between each are recorded. by comparing rings from multiple trees, through cross-dating, a dendrochronologists can determine if rings are missing or if false rings are present. through this process the tree ring record can be used to investigate past climatic conditions. tropical trees often lack annual rings and ages for these trees can be measured using radiocarbon dating of wood samples from the trees.
tree measurement
there is an annual ring ceremony in april in which the junior class receives their class rings and the head of school speaks. during this ceremony, each girl's name is read out and she receives her ring from the head of school and a white rose from the mistress of the rings. the mistress of the rings is a member of the junior class who found the golden ring in the annual ring cake ceremony that occurs prior to the ring ceremony. this ceremony is seen as the junior's passage into being seniors. in the past, the junior would receive her ring from a senior who had been a significant friend or mentor to her. it is unknown why the school changed this most popular part of the tradition.
westridge school (pasadena, california)