The major source of free oxygen in the atmosphere is from_________ .
A) green plants
B) glaciers
C) water
D) molten rock
E) silicate minerals
Correct Answer:
Verified
Q3: The_ means "the sun in the making."
A)presun
B)sol
C)protosun
D)solar
Q4: The "ancient age" time period is the
Q5: Which period is known as the "age
Q6: Which one of the following represents the
Q7: During the _ Era, the westward- moving
Q9: Most of Earth's iron ore occurs in
Q10: The age of Earth is about _.
A)195
Q11: During the late Paleozoic, the present- day
Q12: The beginning of the Phanerozoic marks an
Q13: Following the reptilian extinctions at the close
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