Most of Earth's iron ore occurs in middle ________ rocks.
A) Precambrian
B) Paleozoic
C) Mesozoic
D) Cenozoic
Correct Answer:
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Q22: Most _ rocks are devoid of fossils,which
Q27: The beginning of the _ era is
Q28: During the _ period, large evaporite deposits
Q30: The most economically important resource in Cenozoic
Q31: Earth's primitive atmosphere evolved from gases _.
A)
Q33: By the _ period, large tropical swamps
Q35: Abundant fossil evidence did not appear in
Q36: The _ period is sometimes called the
Q37: This least understood era of Earth's history
Q49: The supercontinent of Pangaea began to break
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