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These assumptions are based on the axioms or worldview the scientist is operating within.

This method includes carbon dating and thermoluminescence.

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.

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.