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Droughts and other variations in the climate make the tree grow slower or faster than normal, which shows up in the widths of the tree rings.

These tree ring variations will appear in all trees growing in a certain region, so scientists can match up the growth rings of living and dead trees.

In a separate article (Radiometric dating), we sketched in some technical detail how these dates are calculated using radiometric dating techniques.

Each dark band represents a winter; by counting rings it is possible to find the age of the tree (Figure 11.22).

The width of a series of growth rings can give clues to past climates and various disruptions such as forest fires.

The methods work because radioactive elements are unstable, and they are always trying to move to a more stable state. This process by which an unstable atomic nucleus loses energy by releasing radiation is called radioactive decay.

The thing that makes this decay process so valuable for determining the age of an object is that each radioactive isotope decays at its own fixed rate, which is expressed in terms of its half-life.

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Using logs recovered from old buildings and ancient ruins, scientists have been able to compare tree rings to create a continuous record of tree rings over the past 2,000 years.

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