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Maybe that was why her boyfriend hated me, that she actually enjoyed spending time and had chemistry with some other guy. Having worked with other songwriters before, I’d figured out that the success or failure of such partnerships often hinged more on how well personalities meshed than it did the abilities of those involved.
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Why is u 238 used for dating rocks

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The extreme temperatures of the magma would just destroy the bones.So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash.What makes this fact useful is that they occur at different rates, as expressed in their half-lives (the time it takes for half the atoms to decay).The 235U–207Pb cascade has a half-life of 704 million years and the 238U–206Pb cascade is considerably slower, with a half-life of 4.47 billion years.The age is calculated from the position of the fossil or rock relative to the position of nearby igneous rocks above and below the where the fossil is found which CAN be dated by radiometric methods.Of all the isotopic dating methods in use today, the uranium-lead method is the oldest and, when done carefully, the most reliable.Unlike any other method, uranium-lead has a natural cross-check built into it that shows when nature has tampered with the evidence.

Radiometric dating isn't the only method of determining the age of rocks.

Each of them typically exists in igneous rock, or rock made from cooled magma.

Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock.

Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old.

To determine the ages of these specimens, scientists need an isotope with a very long half-life.