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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.This tree ring record has proven extremely useful in creating a record of climate change, and in finding the age of ancient structures. The thick, light-colored part of each ring represents rapid spring and summer growth.Scientists analyze these ice cores to determine how the climate has changed over time, as well as to measure concentrations of atmospheric gases.The longest cores have helped to form a record of polar climate stretching hundreds of thousands of years back.The thin, dark part of each ring represents slow autumn and winter growth.Several other processes result in the accumulation of distinct yearly layers that can be used for dating.For example, layers form within glaciers because there tends to be less snowfall in the summertime, allowing a dark layer of dust to accumulate on top of the winter snow (Figure 11.23).

He assumed that the Earth began as a ball of molten rock, which has steadily cooled over time.These thick layers alternate with thin, clay-rich layers deposited during the winter.

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