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Home Q & A Board Science-Related Homework Help Geography and Earth Sciences
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oiratno oiratno
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7 years ago
Earth's magnetic field 
A)  is variable, and it has phased to zero some nine times during the past 4 million years. 
B)  is constant in its intensity. 
C)  remains a mystery as to its cause. 
D)  is principally generated in the inner core.
Textbook 
Geosystems: An Introduction to Physical Geography

Geosystems: An Introduction to Physical Geography


Edition: 7th
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Geosystems: An Introduction to Physical Geography, 7th Edition (Christopherson)
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twentytootwentytoo
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oiratno Author
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#2
6 years ago
Extremely helpful, thx for answering correctly !
Geosystems: An Introduction to Physical Geography, 7th Edition (Christopherson)
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