Q: The earth's magnetic poles have done what repeatedly in the past?


Read this paragraph and choose the correct option from the provided answers:

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.

 Choices:

- rotated

- stayed the same

- demagnetized

- switched places


A:
switched places