4.6 Billion Years: The Earth's Ancient Story Revealed Through Rock LayersEarth Rocks History Scientists Age Billions Time Radiometric Life Fossils Planet Atoms Dinosaurs Chapters Evidence Estimate Layers Celestial Discover

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earth
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rocks
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history
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scientists
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age
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billions
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time
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radiometric
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life
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fossils
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planet
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atoms
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dinosaurs
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chapters
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evidence
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estimate
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layers
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celestial
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discover
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ancient