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Why are the four major divisions of earths history useful?

User CauseYNot
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Supereon: Precambrian and "n/a" or not named yet.2. Eon: Hadean, Archean, Proterozoic and Phanerozoic.3. Era: Cryptic (....many others...) Paleozoic, Mesozoic and Cenozoic.Human history is divided into ages; including the Neolithic, Stone, Iron, Bronze, Middle, Industrial and Digital.
User Jon Hess
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