Geologic Timescale

When did life on Earth begin?

• 4.6 to 4.0 billion years ago

• 3.9 to 3.5 billion years ago

• 4.6 to 4.0 million years ago

• 3.9 to 3.5 thousand years ago

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Which of the following places the geologic time eras in order from oldest to most recent?

• Precambrian, Paleozoic, Mesozoic, Cenozoic

• Mesozoic, Cenozoic, Paleozoic, Precambrian

• Cenozoic, Mesozoic, Paleozoic, Precambrian

• Paleozoic, Cenozoic, Precambrian, Mesozoic

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The ______________ era covers 80%-88% of earth's history.

• Paleozoic

• Mesozoic

• Cenozoic

• Precambrian

Answer explanation

We highlighted this era orange in our calendar

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

• True
• False

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The Geologic Time Scale is a record of what?

• old geologists

• sweet geology music

• the known history of rocks and fossils

• a list of every living thing ever

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The biggest unit of time on the Geologic Time Scale is ___

(not one we have focused on)

• an era

• a period

• an eon

• an epoch

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Eras are broken into _______.

• eons

• periods

• epochs

• millions of years

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Of the following organisms, which was around (or has been around) for the shortest amount of time?

• Dinosaurs

• Mammals

• Humans

• Reptile

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The geologic time scale is divided by major changes or events such as______.

• mass extinctions

• the extinction of one species

• the development of one new species

• a small temperature change

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Periods are broken up into smaller chunks of time called?

• Epochs

• Periods

• Jurrasic

• Ions

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