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Rubidium–strontium dating - Wikipedia The rubidium-strontium dating method is a radiometric dating technique used by scientists to determine the age of rocks and minerals from the quantities they contain of specific isotopes of rubidium (87 Rb) and strontium (87 Sr, 86 Sr).

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Montana State Parks :: Medicine Rocks Chris Dantic is the park manager at Medicine Rocks State Park. He began his career with Montana State Parks in 2003. He has worked at Chief Plenty Coups, First Peoples Buffalo Jump, Giant Springs, Sluice Boxes, Tower Rock and Smith River State Parks.

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Changing Views of the History of the Earth Many authors choose to present the history of a complex subject by breaking it up into major threads and following the history of each thread separately.

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6. How long is material radioactive? carbon-14. (4) Geological dating of igneous rocks. Certain elements with very long half-lives can be used to date the geological age of igneous rocks and even the age of the Earth. has a half-life of 1.3 x 10 9 years.

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Radiometric dating - Wikipedia Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.