Chapter 6 Lesson 4 Geologic Time Scale

The geologic time scale is a record of...

• human activity

• geologic events

• the centuries since Earth formed

• the evolution of life forms

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After Precambrian time the scale is divided into 3 eras. What are they?

• Precambizoic

• Paleozoic

• Mesozoic

• Cenozoic

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What are the first division that Era are divided into?

• Eons

• Epochs

• Periods

• Ages

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Which section of the Geologic Time Scale is 88% of Earth's history?

• Precambrian

• Mesozoic

• Cenozoic

• Paleozoic

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Which Era do humans live in?

• Cenozoic

• Mesozoic

• Paleozoic

• Phanerozoic

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Which Era does this creature belong to?

• Cenozoic

• Mesozoic

• Paleozoic

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Which division of geologic time does this creature belong?

• Precambrian time

• Mesozoic

• Paleozoic

• Cenozoic

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Which division of time does this creature belong to?

• Cenozoic

• Mesozoic

• Paleozoic

• Precambrian time

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What do scientists base the divisions of geologic time on?

• They are based on equal segments of time.

• They are based on the type of rocks being created.

• They are based on major changes in the fossil and rock record.

• The are based solely on human activity.

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Why did geologists create the Geologic Time Scale?

• To help map out the spread of life forms in the American Continent

• To help make sense of Earth's long history and make it easier to manage.

• To show other scientists how time works.

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