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Relative dating is a dating method that used to determine determine the relative ages of geologic strata, artifacts, historical events, etc.
Between the years of 17, James Hutton and William Smith advanced the concept of relative dating.
Ice cores showed the age of a military plane buried in the artic as thousands of years old.
Similarly, dendrochronology measures the tree rings in trees and assumes they represent years.
However, unlike tree-ring dating -- in which each ring is a measure of 1 year's growth -- no precise rate of deposition can be determined for most of the rock layers.