Rock Deformation and Mountain The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay. This can be seen in the concordia diagram, where the samples plot along an errorchron straight line which intersects the concordia curve at the age of the sample. The carbon dioxide mixes throughout the atmosphere, dissolves in the oceans, and via photosynthesis enters the food chain to become part of all plants and animals. In Roth, Etienne; Poty, Bernard eds.
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Lesson Summary Let's review.
Obviously, if the substance you are measuring is contaminated, then all you know is the age since contamination, or worse, you don't know anything, because the contamination might be in the opposite direction - suppose, for example, you're looking at radio carbon carbon 14, which is produced in the atmosphere by cosmic rays, and which decays into nitrogen. This became known as the Libby half-life. Morton Gneiss [see Editor's Note ] Samples from outcrops in southwestern Minnesota are believed to represent some of the oldest rocks in North America.