If all Earth’s history took place in one year starting on January 1, humans would have appeared in _______________
Earth formed layers because _____ pulled more dense material to the center.
Geologic time is divided into units based upon types of _____.
The longest subdivision in geologic time is a(n) _____.
Little is known about much of Earth’s early history because _____.
The division of Earth’s history into smaller units makes up the _____.
Geologists organized the geologic time scale based on _____.
A life-form in the Precambrian time was _____.
After the Sun formed, gravity _____.
During the great Proterozoic eon, the percentage of oxygen in the atmosphere changed _____.
Two supercontinents, _____ and _____, had warm shallow oceans near the shores.
Toward the end of the Proterozoic eon, which of the following formed?
Why do scientists hypothesize that an asteroid impact led to a mass extinction event?
Major changes in the environment _____.
How would an asteroid impacting Earth effect the climate?
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