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Which of the followig gases was NOT part of Earth's original atmosphere?
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
Some continents contain large core area of Precambrian rocks called
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
The largest expanse of time on the geological time scale is the
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
During the early Paleozoic era, South America, Africa, Australia, Antartica, India and perhaps China comprised the vast southern continent of
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
About 88% of Earth's history is with the expanse of time before the Phanerozoic Era called the ___________.
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
What is the major source of free oxygen in the atmosphere?
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
The Paleozoic era lasted about
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
The era of ancient life iis know as the
Gondwanda
shields
Precambrian
oxygen
292 million years
eon
green plants
Paleozoic
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