Simple definition of radiometric dating
So if scientists wanted to measure the age of a fossil using this method, they would look for a nearby layer of igneous rock (e.g.
rock that forms from lava from a volcanic eruption)—perhaps in the rock layers above where the fossil was found, or in the layers below.
C in the atmosphere haven’t been constant throughout history (for instance, Noah’s Flood lowered the total amount of available carbon by burying lots of animals and plants).
So something that lived (and died) when the proportion of C was less than normal would appear to have died more years ago than it actually did (for example, it might give an age of 3,000 years before the present, rather than its true age of 2,000 years).
As radioactive isotopes of elements decay, they lose their radioactivity and become a brand new element known as a daughter isotope.
In fact, most fossils do not even contain radioactive minerals.Some elements (we’ll call them “A”) in the lava are radioactive, which means that they change into other elements (we’ll call these “B”).
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