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Show Tree Thirteen Centuries Old. . A tree's age is determined by the number of rings of wood its trunk contains. con-tains. The woody fiber is slower in growing in winter than in summer and consequently distinct rings are formed, form-ed, each representing a year. By means of these rings the gigantic cross-section of a California tree 1,341 years old is used at the New York Museum of Natural History as a history chart and as such it shows in a novel way the sequence of events in the last thousand years. |