Geologic Timescale

Scientists chose where units of geologic time began and ended based on major changes in life forms at certain times.

• True

• False

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NGSS.MS-ESS1-4

NGSS.MS-LS4-1

The Geologic Time Scale is a record of what?

• old geologists

• sweet geology music

• the known history of rocks and fossils

• a list of every living thing ever

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NGSS.MS-ESS1-4

NGSS.MS-ESS2-3

The biggest unit of time on the Geologic Time Scale is ___

(not one we have focused on)

• an era

• a period

• an eon

• an epoch

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NGSS.MS-ESS1-4

Eras are broken into _______.

• eons

• periods

• epochs

• millions of years

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NGSS.MS-ESS1-4

The geologic time scale is divided by major changes or events such as______.

• mass extinctions

• the extinction of one species

• the development of one new species

• a small temperature change

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NGSS.MS-ESS1-4

Periods are broken up into smaller chunks of time called?

• Epochs

• Periods

• Jurrasic

• Ions

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NGSS.MS-ESS1-4

Which EON name relates to visible life?

(you don't need a microscope)-- not an Era or Period

• Hadean

• Archean

• Phanerozoic

• Proterozoic

Which era is the longest?

• Cenozoic

• Cambrian

• Precambrian

• Phanerozoic

Tags

NGSS.MS-ESS1-4

Which Era was mainly dominated by dinosaurs?

• Cenozoic

• Jurassic

• Mesozoic

• Paleozoic

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NGSS.MS-ESS1-4

NGSS.MS-LS4-1

Which Era occurred last (most recent)?

• Cenozoic

• Mesozoic

• Paleozoic