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09-Dec-2017 13:42

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.

and is now the principal source of information about the absolute age of rocks and other geological features, including the age of fossilized life forms or the age of the Earth itself, and can also be used to date a wide range of natural and man-made materials.

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Among the best-known techniques are radiocarbon dating, potassium–argon dating and uranium–lead dating.

One can also visit the numerous historical attractions in North Reading.



The Common Historic District is a historic district encompassing the civic and institutional heart of Reading, Massachusetts. The district is centered on the town common, at the intersection of Main and Salem Streets. The common has been communally owned since at least 1737, with the original burying ground expanded.… continue reading »


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