The easiest way to estimate an igneous rock's absolute age is to determined by measuring the amounts of radioactive isotopes in the rock.
When molten rock cools and crystallizes, igneous rocks named for the Latin word for fire are created. A hot spot or active plate boundary is where the melt begins to form from deep inside the Earth and rises to the surface.
In order to estimate the absolute age of an igneous rock, radiometric isotopes must first be employed to calculate the quantity of radioactive isotopes contained in the rock. This method is the best way to determine the age of an igneous rock.
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