Earth Is Not Thought to Have a Permanent Magnet in Its

Multiple Choice

Earth is not thought to have a permanent magnet in its interior because the

A) magnetic field reverses direction over periods of tens of thousands of years.
B) magnetic field distribution in space around Earth does not match that of a permanent magnet.
C) rotation of Earth quickly destroys the properties of a permanent magnet.
D) core is not made of magnetic material.