How did scientists form the geologic time scale?
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The geologic time scale was developed after scientists observed changes in the fossils going from oldest to youngest sedimentary rocks. They used relative dating to divide Earth's past in several chunks of time when similar organisms were on Earth.
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They developed the geological time scale by looking at how many layers they had to dig through rock and how decomposed the radioactive substances was inside of it. They then determined when other organisms lived that were simaler to the fossil they dug up, they named the era after where they found the fossils.
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