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How the age of a tree can be estimated from the analysis of the rings present on a cross section of its stem?
For the growth of the tree it is essential to have formation of new vessels within the stem, a task performed by the vascular cambium. The vascular cambium is more dynamic in hot seasons (spring and summer) generating a lighter band made of large calibered vessels. During the winter and fall the vascular cambium produces the opposite, so small calibered vessels and a darker band appear outside the previous lighter band. Consequently two ring bands are made yearly, one lighter and the other darker. By a straight count of these band pairs one can estimate the age of the tree.
South Dakota and Oregon are at similar latitudes, and yet, on average, Oregon has warmer winters and cooler summers than South Dakota does. What property of water helps account for
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