The Geologic Time Scale

The ________ ____ _____ is a record of life forms and geologic events in Earth's history.

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NGSS.MS-ESS1-4

Geologists use the geologic time scale to show Earth's history.

• True

• False

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NGSS.MS-ESS1-4

How are radioactive dating and relative age connected to the geologic time scale?

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Geologic time begins with a long span of time called ___________ _____, which covers about 88 percent of Earth's history and ended 544 million years ago.

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After Precambrian Time, the basic units of geologic time scale are (more than one answer)

• eras

• centuries

• periods

• decades

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Geologists divide the time between Precambrian Time and the present into three long units of time called ____.

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The three main eras in the geologic time scale are

• Mesozoic Era

• Benzoic Era

• Cenozoic Era

• Denozoic Era

• Paleozoic Era

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Eras are subdivided into units of geologic time called _______.

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NGSS.MS-ESS1-4

The Mesozoic Era includes three periods:

• Cretaceous Period

• Time Period

• Triassic Period

• Year Period

• Jurassic Period

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The names of many of the geologic periods come from places around the world where geologists first described the rocks and fossils from that period.

• True

• False

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