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Analyzing specimens whose relative geologic ages were known, Boltwood found that the ratio of lead to uranium did indeed increase...

So we can't pick up an artifact that's made from volcanic rock and get a potassium argon date on the artifact.The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record.One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.This lesson is the third in a three-part series about the nucleus, isotopes, and radioactive decay.The first lesson, Isotopes of Pennies, deals with isotopes and atomic mass.




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In order to lock in a profit on day one of an options grant, some executives simply backdate (set the date to an earlier time than the actual grant date) the exercise price of the options to a date when the stock was trading at a lower level. In this article, we'll explore what options backdating is and what it means for companies and their investors. Most businesses or executives avoid options backdating; executives who receive stock options as part of their compensation, are given an exercise price that is equivalent to the closing stock price on the date the options grant is issued.


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