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

• true

• false

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Scientists divided the time between Precambrian time and the present into four units of time, or eras.

• false

• true

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Periods are subdivided into units of geologic time called eras.

• false

• true

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

• Names

• Dates

• Sounds

• Tastes

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