To examine the rings of a tree without felling it, cores can be taken by boring into the wood with a hollow cylinder. By counting them inwards each ring can be accurately dated, the age of the tree can be determined and past climatic conditions can be inferred. For accuracy a number of trees is sampled and the ring widths compared. If they coincide, as they normally do, then narrow rings will indicate a poor growing season, probably one with a spring and early summer drought, Read the rest of this entry »
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