Explain How Radiometric Dating And The Fossil Record Supports The Theory Of Evolution

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Radiometric dating - Understanding Evolution
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How Is Radioactive Dating Used to Determine the Age of an . . .
Radiometric Dating: Problems with the Assumptions . . .
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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 ."
Isotopes Used for Dating . There are several common radioactive isotopes that are used for dating rocks, artifacts and fossils . The most common is U-235 . U-235 is found in many igneous rocks, soil and sediment . U-235 decays to Pb-207 with a half-life of 704 million years . Due to its long half-life, U-235 is the best isotope for radioactive . . .
Therefore, some discovered fossils are able to be dated according to the strata, a distinct layer of rock, that they are found in . Another common way that fossils are dated, is through radiocarbon dating . The development of this type of dating , in the 1950s, transformed paleontology and enhanced the accuracy of the fossil record .
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Prior to the availability of radiometric dating , and even prior to evolutionary theory , the Earth was estimated to be at least hundreds of millions of years old . Radiometric dating has simply made the estimates more precise, and extended it into rocks barren of fossils and other stratigraphic tools .
Beds that preserve fossils typically lack the radioactive elements needed for radiometric dating (" radiocarbon dating " or simply "carbon dating ") . The principle of radiocarbon dating is simple: the rates at which various radioactive elements decay are known, and the ratio of the radioactive element to its decay products shows how long the radioactive element has existed in the rock .
For example, the fossil record is consistent in terms of biogeography — and if evolution is true, we would expect that the fossil record would be in harmony with current biogeography, the phylogenetic tree, and the knowledge of ancient geography suggested by plate tectonics . In fact, some finds, such as fossil remains of marsupials in Antarctica are strongly supportive of evolution , given that Antarctica, South America, and Australia were once part of the same continent .
Absolute dating is used to determine a precise age of a fossil by using radiometric dating to measure the decay of isotopes, either within the fossil or more often the rocks associated with it . Relative Dating The majority of the time fossils are dated using relative dating techniques . Using relative dating the fossil is compared to something . . .
Now that we know how radiometric dating actually works, let's see the evidence of its inaccuracy and unreliability with two major radiometric dating methods . . . Carbon-14 Dating Carbon-14 actually decays so quickly—with a half-life of only 5,730 years—that none is expected to remain in fossils after only a few hundred thousand years .
Radioactive dating uses the decay rates of radioactive substances to measure absolute ages of rocks, minerals and carbon-based substances, according to How Stuff Works . Scientists know how quickly radioactive isotopes decay into other elements over thousands, millions and even billions of years . Scientists calculate ages by measuring how much of . . .
The reliability of radiometric dating is subject to three unprovable assumptions that every geologist must make when using the radioactive "clock" . Radioactive rocks offer a similar "clock ." Radioactive atoms, such as uranium ( the parent isotopes), decay into stable atoms, such as lead ( the daughter isotopes), at a measurable rate .
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Explain How Radiometric Dating And The Fossil Record Supports The Theory Of Evolution