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Radioactive dating the earth

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The initial ratio has particular importance for studying the chemical evolution of the Earth's mantle and crust, as we discussed in the section on igneous rocks. K-Ar Dating 40K is the radioactive isotope of K, and makes up 0. Since K is one of the 10 most abundant elements in the Earth's crust, the decay of 40K is important in dating rocks. But this scheme is not used because 40Ca can be present as both radiogenic and non-radiogenic Ca. Note that this is not always true. If a magma cools quickly on the surface of the Earth, some of the Ar may be trapped.
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Radioactive decay

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Radiometric dating - Wikipedia

Kevin Newton Kevin has edited encyclopedias, taught middle and high school history, and has a master's degree in Islamic law. If you want to know how old a person is, you ask them. If you want to get an idea about a tree's age, you count its rings. But what if you want to know the age of the Earth? In this lesson, we'll get an idea of how scientists date our planet.
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Radioactive Dating Game

Relative dating Studies of strata , the layering of rocks and earth, gave naturalists an appreciation that Earth may have been through many changes during its existence. These layers often contained fossilized remains of unknown creatures, leading some to interpret a progression of organisms from layer to layer. Lomonosov's ideas were mostly speculative. In the Comte du Buffon tried to obtain a value for the age of Earth using an experiment:
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Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus.
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