The earth's magnetic poles have done what repeatedly in the past?
demagnetized
rotated
stayed the same
switched places
Earth’s magnetic poles have switched places repeatedly in the past. As you can see in the Figure below , each time the switch occurred, Earth’s magnetic field was reversed. The magnetic field is the region around a magnet over which it exerts magnetic force. We think of today’s magnetic field direction as “normal,” but that’s only because it’s what we’re used to. You can watch a simulation of a magnetic field reversal at this URL: http://www. pbs. org/wgbh/nova/earth/when-our-magnetic-field-flips. html.