Evolution and the Geological Time Scale

The geologic time scale is a record of the geologic events and the evolution of life forms as shown in the fossil record.

• True

• False

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

• life forms

• ocean levels

• weather patterns

• Tik Tok dances

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The first step in developing the geologic time scale was studying rock layers and index fossils worldwide.

• true

• false

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Because the time span of Earth's past is so great, geologists use the _____________ time scale to show Earth's history.

• geologic

• eras

• Pre Cambrian

• super fun

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Because the time span of Earth's past is so great, geologists use the ​ (a)   to show Earth's history.

• geologic time scale

• graphical time span

• geological time frame

• geographical time set

• gigantic fossil index

• geologic fossil index

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Label the Geologic Time Scale in order from oldest to most recent

a

b

c

d

e

f

g

200,000 years Modern Humans

250 million years Permian Extinction

4.4 billion years Arrival of Water

500 million years Plants on land

4.5 billion years Formation of Earth

3.7 billion years Earliest signs life

375 million years Animals on land

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During which geologic time or era did humans first appear?

• Cenozoic

• Mesozoic

• Paleozoic

• Precambrian

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The long span of time that begins geologic time is called _____________.

• Precambrian Time

• Mesozoic

• Cenazoic

• a long time ago

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Geologist divided the time between Precambrian Time and the present into three long units of time called _____________.

• eras

• periods

• epochs

• seconds

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The Triassic Period, the Jurassic Period, and the Cretaceous Period occurred in the ___________________ Era.

• Mesozoic

• Precambrian

• Cenozoic

• Instagram

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