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Scientists determined the Earth's age using a technique called radiometric dating.Radiometric dating is based upon the fact that some forms of chemical elements are radioactive, which was discovered in 1896 by Henri Becquerel and his assistants, Marie and Pierre Curie.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.We can get absolute ages only if we have rocks from that surface.For others, all we are doing is getting a relative age, using things like the formation of craters and other features on a surface.The rates of decay of various radioactive isotopes have been accurately measured in the laboratory and have been shown to be constant, even in extreme temperatures and pressures.

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Some radioactive parent isotopes decay almost instantaneously into their stable daughter isotopes; others take billions of years.

Carbon dating has given archeologists a more accurate method by which they can determine the age of ancient artifacts.

Libby invented carbon dating for which he received the Nobel Prize in chemistry in 1960.

The technique of comparing the abundance ratio of a radioactive isotope to a reference isotope to determine the age of a material is called radioactive dating.

Many isotopes have been studied, probing a wide range of time scales.

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Bear in mind, that some minor relationships have been skipped out... Still, it must have felt like a right slap in the face to break-up and then to see her ex-lover be romantically involved with such a close friend. As Donovan did a stint on Friends, he also recently revealed that that working with her on set was absolutely awful. Funny man Paul Rudd and Jennifer met during the filming of The Object of My Affection and were in a relationship that lasted around a year. We really hoped that Vince Vaughn would be the man to mend Jen's broken heart and pick her up from the bottomless abyss that she was mercilessly thrown into.

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