Study Guide - Our Planet Earth

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How many eras is the geologic time scale divided into?

4

Current scientific evidence shows that the Earth is estimated to be _______ years old.

4.6 billion

What era are we currently in at this time?

Cenozoic

List the 4 eras in order from the most recent, to the one that occurred the longest ago.

Cenozoic, Mesozoic, Paleozoic, Precambrian

How long in a geologic time period?

It varies

The ________ era was dominated by dinosaurs.

Mesozoic

The earliest forms of life occurred during the ____ era.

Precambrian

Why was the geologic sandwich so hard to make?

The ingredients overlapped


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