by 
KevinW42
ANSWERS: 2
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The polarity of the earth is recorded in layers in the sea bed... The sea bed has many reversing strips, each one indicating a reversed north pole, and it patterns like this throughout history
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"The Earth's magnetic field determines the magnetization of lava as it is laid down on the ocean floor on either side of the Mid-Atlantic Rift where the North American and European continental plates are spreading apart. As the lava solidifies, it creates a record of the orientation of past magnetic fields much like a tape recorder records sound." https://www.nasa.gov/topics/earth/features/2012-poleReversal.html
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