Earth age dating methods
The half-life is the time that it takes for half the radioactive sample to change from one element into the other.
European oak trees have been used to build a 12,000-year chronology.These methods are largely independent of each other, based on separate observations and arguments, yet all point to a history much longer than 10,000 years.As Christians, we believe that God created the world and that the world declares his glory, so we can’t ignore what nature is telling us about its history.The oldest reliably dated rock formation is in Greenland, where several different isotopes were used to find an age of 3.6 billion years.To find older rocks that haven’t been eroded, we need to look beyond Earth.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.
Many independent measurements have established that the Earth and the universe are billions of years old.
Geologists have found annual layers in ice that are easily counted to multiple tens of thousands of years, and when combined with radio isotope dating, we find hundreds of thousands of years of ice layers.
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.
Radiometric dating requires that one understand the initial ratio of the two elements in a given sample by some means.