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Geological Time

Dates of Eras

what is a carbon film? an extremly thin coating of carbon on rock
how do you determine the absolute age? geologists use radio-active dating
what is the rate of decay of an element? It is constant- It never changes
what is relative age? to compare rock layers older and younger
what is absolute age? the exact number of years of a rock
What era did pangea start? Mesozoic
Earths oceans form in what era? precambrian
Created by: cherrygirl1243