We know it is accurate because radiometric dating is based on the radioactive decay of unstable isotopes. When an unstable Uranium (U) isotope decays, it turns into an isotope of the element Lead (Pb). We call the original, unstable isotope (Uranium) the parent, and the product of decay (Lead) the daughter.

How is an accurate radiometric date established how is this process relate to the creation of geologic time scale?

Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geologic time scale. By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.

What is radiometric dating used to date?

To determine the ages in years of Earth materials and the timing of geologic events such as exhumation and subduction, geologists utilize the process of radiometric decay. Geologists use these dates to further define the boundaries of the geologic periods shown on the geologic time scale.

How is radiometric dating inaccurate?

Then from mixing, one can produce an isochron having a spurious age. This shows that computed radiometric ages, even isochrons, do not have any necessary relation to true geologic ages. Mixing can produce isochrons giving false ages. But these same chemical fractionation processes call radiometric dating into question.

How long does volcanic ash stay in the air?

The aerosols can stay in the stratosphere for up to three years, moved around by winds and causing significant cooling worldwide.