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Geologic Time By examining layers of sedimentary rock, geologists developed a time scale for dividing up earth history. Earlier in the 20th century, - ppt download
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Relative vs. Absolute Dating in Geology | Overview, Differences & Examples - Video & Lesson Transcript | Study.com
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Relative vs. Absolute Dating in Geology | Overview, Differences & Examples - Video & Lesson Transcript | Study.com
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