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I think the Iraqi girl whom did the comment is beautiful XD. As a member, you'll also get unlimited access to over 70, lessons in math, English, science, history, and more. Plus, get practice tests, quizzes, and personalized coaching to help you succeed. Serosorting Log in or sign up to add this lesson to a Custom Course.Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes. Learn about It works because we know the fixed radioactive decay rates of uranium, which decays to lead- , and for uranium, which decays to lead So, we start out with two. The existence of two 'parallel' uranium–lead decay routes (U to Pb and U to Pb) leads to multiple dating techniques within the overall U–Pb system. The term U–Pb dating normally implies the coupled use of both decay schemes in the 'concordia diagram' (see below). However, use of a single decay scheme.

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Describe your changes optional Carbon 14 with a half life of 5, years can only be used to date fossils of approximately 50, years. Most fossils are thought to be much older than 50, years. Also most fossils no longer contain any Carbon. The fossilized remains have been mineralized where the original organic material has been replaced and turned into stones containing no carbon.

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Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4. Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

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Quantum electronics to Reasoning. The discovery of the radioactive properties of uranium in by Henri Becquerel subsequently revolutionized the way scientists measured the age of artifacts and supported the theory that the earth was considerably older than what some scientists believed.

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