Describe absolute datingnumerical age

Scientists analyze these ice cores to determine how the climate has changed over time, as well as to measure concentrations of atmospheric gases.

This pattern of growth results in alternating bands of light-colored, low density "early wood" and dark, high density "late wood".Radioactive materials in Earth's interior provide a steady source of heat.Calculations of Earth's age using radioactive decay showed that Earth is actually much older than Thomson calculated.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.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.

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