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Geological Time
Dates of Eras
Question | Answer |
---|---|
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 |