How old is the earth based on radiometric dating

Then the computed age based on the accumulation of daughter products will be incorrect (Stasson 1998).In order to use the valuable information provided by radiometric dating, a new method had to be created that would determine an accurate date and validate the assumptions of radiometric dating. Isotope dating satisfies this requirement, as daughter products do not decay back to the original parent element.These assumptions include: 1) the initial amount of the daughter isotope is known, 2) neither parent or daughter product has migrated into, or out of, the closed rock system, and 3) decay has occurred at a constant rate over time.But what if one or some combination of these assumptions is incorrect?[Dear Science: Where do old spacecraft go when they die?

Relative age dating also means paying attention to crosscutting relationships.The "begats" in the Bible were another source for estimates: In the 17th century, Ireland's Archbishop James Ussher reconstructed the genealogy of biblical figures and declared that Earth was created at 6 p.m. The modern effort to understand the age of the planet started with Nicholas Steno, a Danish anatomist and geologist who was among the first to realize that fossils are the remains of living creatures.He proposed that geologists might learn about Earth's history by sifting through layers of rock, which were laid down over the course of millennia and provide a backward chronology of our planet.Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.

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