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In radiometric dating, the decaying matter is called the parent isotope and the stable outcome of the decay is called the daughter product.Since the half-life of carbon-14 is 5730 years, scientists can measure the age of a sample by determining how many times its original carbon-14 amount has been cut in half since the death of the organism.
However, further study is warranted to explore any potential significance in this discrepancy in half-lives and decay constants between earth materials, and meteorites and lunar rocks.
However, rocks and other objects in nature do not give off such obvious clues about how long they have been around.
So, we rely on radiometric dating to calculate their ages.
It has become increasingly clear that these radiometric dating techniques agree with each other and as a whole, present a coherent picture in which the Earth was created a very long time ago.
Further evidence comes from the complete agreement between radiometric dates and other dating methods such as counting tree rings or glacier ice core layers.