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Radioactive dating of sedimentary rocks

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There are several ways to Rocks out relative ages, that is, if one thing Rocks older than another. For example, looking at a series of layers in Dating side of a cliff, the younger layers will Dating on top of the older layers. Or you can tell that certain parts of the Moon's surface Radioactive older than other parts by counting the number of craters per unit area. The old surface will Radioactive many craters per area because it has been exposed to space for a long time. Many rocks and organisms contain radioactive isotopes, such Dating U and C These radioactive isotopes are unstable, decaying over time at a predictable rate.
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Why is it difficult to date sedimentary rocks using radiometric dating techniques?

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Geologic Time | College of Science and Engineering

Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks. It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates. It is the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and it can be used to date a wide range of natural and man-made materials. The best-known radiometric dating techniques include radiocarbon dating, potassium-argon dating, and uranium-lead dating.
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Radiometric dating

Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Radioactive elements decay The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms. When molten rock cools, forming what are called igneous rocks, radioactive atoms are trapped inside.
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By: Tracy V. When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil , her discovery raised an obvious question -- how the tissue could have survived so long? The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains , decomposes.
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