What physical phenomenon predominantly contributes to the magentic field of the earth?   a. The ionization of metals in the earth's crust   b. The total amount of ferromagnetic iron, cobalt, and nickel that is present in the earth's crust   c.  Ion convection in the molten liquid shell that surrounds the earth's solid inner core

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter19: Electric Forces And Electric Fields
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What physical phenomenon predominantly contributes to the magentic field of the earth?

  a.

The ionization of metals in the earth's crust

  b.

The total amount of ferromagnetic iron, cobalt, and nickel that is present in the earth's crust

  c.

 Ion convection in the molten liquid shell that surrounds the earth's solid inner core

  d.

Charged particles from the solar wind that enter the earth's atmosphere

  e.

Ionization in the earth's atmosphere

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