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What is the longest division of time in the geologic time scale?

User Aleb
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Answer:

eon

Step-by-step explanation:

User Aleena
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The longest division of time in the geologic time scale is the Eon. It spans hundreds to thousands of millions of years. The two biggest Eons are the Precambrian eon and the Phanerozoic eon.
User Jon Wei
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