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The division of Earth’s history into smaller units makes up the _____.
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
Little is known about much of Earth’s early history because _____.
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
Earth formed layers because _____ pulled more dense material to the center.
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
The longest subdivision in geologic time is a(n) _____.
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
During the great Proterozoic eon, the percentage of oxygen in the atmosphere changed _____.
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
How would an asteroid impacting Earth effect the climate?
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
A life-form in the Precambrian time was _____.
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
Toward the end of the Proterozoic eon, which of the following formed?
eon
from 3% to 20%
geologic time scale
The dust and rocks thrown into the atmosphere rapidly cause global cooling.
all of the above
the first multicellular organisms
Gravity
cyanobacteria
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