Why is the outer core the source of Earths magnetic field? (a) Moving liquid iron particles there
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Why is the outer core the source of Earth’s magnetic field?
(a) Moving liquid iron particles there form an electric current, and an electric current always produces a magnetic field.
(b) It has north and south magnetic poles that reverse over time.
(c) It contains iron, a magnetic material.
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Related Book For 
Conceptual Integrated Science
ISBN: 9780321818508
2nd Edition
Authors: Paul G Hewitt, Suzanne A Lyons
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