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The problem with continental drift was no mechanism could be found by which the continents could drift through the solid rock of the ocean seafloor.

In the 1950s the US Navy found the evidence of alternating polarity magnetic stripes on the ocean seafloor that were symmetrical on opposite sides of the midocean ridges. But this information was kept classified until the late 1970s. When it was declassified and made available to geophysicists it became the proof that showed the continents were not drifting as Wegener proposed, but the earth's crust was divided into plates that dragged the continents along with them as they moved.

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Q: What is the theory of is an outgrowth of Alfred Wegener's theory of continental drift?
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