During the past 4 million years,_____geomagnetic reversals have occurred.
A) 9
B) 25
C) 50
D) 100
E) 1,000
Correct Answer:
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Q42: The major rocks of Earth's crust are
Q43: At least 90% of Earth's magnetic field
Q44: Which rock type makes up approximately 90%
Q45: The rigid crust and uppermost mantle are
Q46: Molten rock beneath the Earth's surface is
Q48: Obsidian is an igneous rock with a
Q49: Approximately 95% of the Earth's crust is
Q50: The three basic rock types are
A)conglomerates,clastics,and evaporative.
B)intrusive,extrusive,and
Q51: Earth's magnetic poles
A)are fixed.
B)are migrating approximately 60
Q52: The plastic layer in the mantle from
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