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
