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A tree’s age can be found by simply counting its rings.By comparing the pattern of thick and thin rings to weather records, scientists can verify that the method is accurate.Meteorites are rocks from the solar system that have fallen to Earth recently and haven’t suffered much erosion.
For example, Potassium-40 is unstable and decays into Argon-40.
This conclusion is not based on just one measurement or one calculation, but on many types of evidence.
Here we will describe just two types of evidence for an old Earth and two types of evidence for an old universe; more types can be found under further reading.
Like the tree rings, this method can be verified by comparison to historical records for weather, as well as to records of volcanic eruptions around the globe that left thin dust layers on the glaciers.
Scientists have drilled ice cores deep into glaciers and found ice that is 123,000 years old in Greenland In your high school science classroom, you may have seen a large poster of the periodic table hanging on the wall.