Geologic Time Scale

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What is the Cenozoic Era?

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The most recent era in the geologic time scale, marked by the appearance of new mammals, increased diversity of life forms, and the presence of humans. Flowering plants became the most common.

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NGSS.MS-ESS1-4

NGSS.MS-LS4-1

NGSS.MS-LS4-2

Front

What is mass extinction?

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The extinction of a large number of species within a relatively short period of geologic time.

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NGSS.MS-LS4-1

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What is radioactive dating?

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A method that made the Geologic Time Scale more specific by determining the age of rocks and fossils through the decay of radioactive isotopes.

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NGSS.HS-PS1-8

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What is relative dating?

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A method used to determine the age of rocks and fossils by comparing them to other rocks and fossils.

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What are the three periods of the Mesozoic Era?

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Cretaceous Period, Jurassic Period, and Triassic Period.

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What significant event marks the end of the Mesozoic Era?

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The mass extinction event that led to the extinction of the dinosaurs.

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NGSS.MS-LS4-1

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What is the Precambrian Time?

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The earliest part of Earth's history, covering about 88% of the geologic time scale, before the appearance of complex life.

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NGSS.MS-ESS1-4

Front

What major developments occurred during the Paleozoic Era?

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The emergence of fish, amphibians, and the first reptiles, along with the development of extensive forests.

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NGSS.MS-LS4-1

NGSS.MS-LS4-2

Front

What is the significance of the Geologic Time Scale?

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It provides a framework for understanding Earth's history and the timing of major geological and biological events.

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NGSS.MS-ESS1-4

Front

How do scientists use fossils in the Geologic Time Scale?

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Fossils help to identify and date the different periods and eras in the Geologic Time Scale.

Tags

NGSS.MS-ESS1-4

NGSS.MS-LS4-1