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rock layers

contain evidence that Earth is very old

the geologic time scale was developed using

fossils and superposition

If Earth's history lasted only one year, humans would have appeared


process in which one element changes into another

radioactive decay

states that older rock layers are generally under younger rocks


the longest units of geologic time


time it takes for half of a radio active element to break down into another elelment


preserved remains or evidence of ancient life-forms


stable substance formed from a radioactive one

daughter element

a scale of Earth's natural history

geologic time scale

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