Most of Earth's iron ore occurs in middle_________ rocks.
A) Precambrian
B) Cenozoic
C) Mesozoic
D) Paleozoic
Correct Answer:
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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
Q8: The major source of free oxygen 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
Q14: Which of the following gases was not
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