Certain rock types can be used to determine the locations of past magnetic poles because ____.
a. the Earth's magnetic poles have reversed many times during its history
b. the magnetic poles and geographic poles differ slightly
c. iron-bearing minerals align themselves in the direction of the current magnetic field when the rock cools below the Curie point
d. lava flows in Europe all showed that the continent was once located in the southern hemisphere
e. the north magnetic poles of each continent are identical for each geological period
c. iron-bearing minerals align themselves in the direction of the current magnetic field when the rock cools below the Curie point
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