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Timescale of Earth's Events 2-ESS1-1

NGSS

eon

the largest unit of the geologic time scale, it is divided into eras, periods, and epochs
eon Simple Definition

epoch

a unit of geologic time longer than an age but shorter than a period
epoch Simple Definition

era

the second-longest unit of geologic time, it is divided into periods
era Simple Definition

evolution

the change in a species over time
evolution Simple Definition

geologic time scale

a timeline of Earth's history based on major changes
geologic time scale Simple Definition

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