Geologic Time Scale

The geologic time scale is a record of

 

•   the thickness of sedimentary rock layers.

• the rate of fossil formation.

• the life forms and geologic events in Earth’s history.

• the time since the evolution of dinosaurs.

   

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NGSS.MS-ESS1-4

The Paleozoic, Mesozoic, and Cenozoic are divisions in the geologic time scale called

• epochs

• periods

• layers

• eras

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NGSS.MS-ESS1-4

The earliest life-forms appeared during

• Precambrian Time

• Paleozoic Era

• Mesozoic Era

• Cenozoic Era

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NGSS.MS-LS4-1

To develop the geologic time scale, scientists studied rock layers and fossils.

• True

• False

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NGSS.MS-ESS1-4

NGSS.MS-LS4-1

   List the units of geologic time in order from the largest to the smallest.

• epochs, periods, eras, eons

• periods, eras, eons, epochs

• eons, eras, periods, epochs

• eons, periods, eras, epochs

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NGSS.MS-ESS1-4

  A trend we see in the geologic time scale is that fossils become more _____________ over time.

• simple

• complex

• heavy

• difficult

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NGSS.MS-LS4-1

Jawless fish were Earth’s first _____________, or animals with backbones.

• mammals

• amphibians

• vertebrates

• invertebrates

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NGSS.MS-LS4-2

During the Cambrian Explosion that began the Paleozoic Era, where did the many new organisms live?

• in desert areas

• in warm, shallow seas

• on land

• in trees

During the Devonian Period, animals that could live on land began to evolve.  These animals still spent part of their lives in the water.  What were these animals called?

• reptiles

• mammals

• amphibians

• trilobites

Tags

NGSS.MS-LS4-1

NGSS.MS-LS4-2

On the geologic time scale, periods are divided into what units?

• eras

• eons

• decades

• epochs

Tags

NGSS.MS-ESS1-4