Why Does Earth Have a Magnetic Field

question 15

Multiple Choice

Why does Earth have a magnetic field?

• A)Because all planets have magnetic fields that were created during the early formation of the solar system.
• B)Because Earth's inner core behaves like a permanent magnet and produces the magnetic field.
• C)Because the motion of the plates generates an electric current that produces the magnetic field.
• D)Because early in Earth's history the outer core behaved like a moving wire coil in an external magnetic field and produced Earth's magnetic field.

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