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.

Question

Quizplus · Accepted Answer

The Earth's magnetic field reverses direction over geological timescales, which is inconsistent with the behavior of a permanent magnet. Permanent magnets have a stable magnetic field that does not reverse spontaneously.

Earth Is Not Thought to Have a Permanent Magnet in Its