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. Afterwards, they decay at a predictable rate.
Permian–Triassic extinction event
Permian–Triassic extinction event - Wikipedia
Before he discovered energy, man used the power of his own muscles to work for thousands of years. To make life better, he uses various forms of energy today more than ever. Nuclear energy has a vast application for peacetime purposes, although in real life there are numerous dangers associated with it. As part of the natural process, a certain amount of radioactivity is found all around us, in every object that surrounds us and in all living things. The radioactive elements that are inside the Earth date back to the time of the formation of the solar system. They are continuously decomposing, that is, radioactively decaying, while creating other elements. With the emergence of geological science, frequent discussions about the age of our planet began, which continues today.
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Tephrochronology is a geochronological technique that uses discrete layers of tephra —volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or archaeological records can be placed. Such an established event provides a "tephra horizon". The premise of the technique is that each volcanic event produces ash with a unique chemical "fingerprint" that allows the deposit to be identified across the area affected by fallout. Thus, once the volcanic event has been independently dated, the tephra horizon will act as time marker. The main advantages of the technique are that the volcanic ash layers can be relatively easily identified in many sediments and that the tephra layers are deposited relatively instantaneously over a wide spatial area.
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