Definiton of radiometric dating
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Although the exact origin and timing of the evolution of dinosaurs is the subject of active research, They became the dominant terrestrial vertebrates after the Triassic–Jurassic extinction event 201 million years ago.
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 can be used to date a wide range of natural and man-made materials.
Radiometric dating is a technique used to date materials such as rocks or carbon, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.
The use of radiometric dating was first published in 1907 by Bertram Boltwood and is now the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and can be used to date a wide range of natural and man-made materials.
Radioactive dating enables geologists to record the history of the earth and its events, such as the dinosaur era, within what they call the geologic time scale.
Radioactive dating uses the ratios of isotopes and their specific decay products to determine the ages of rocks, fossils and other substances.
a type of radiometer consisting of an evacuated glass bulb containing a set of lightweight vanes, each blackened on one side.