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Key terms: crust rift oceanic spreading ridge arm plates seafloor basins continental oceanic crust pacific earth theory formed active becomes completely continental drift seafloor spreading weight mantle wegener africa past new oceanic hess geology failed today continental crust rise opening rug atlantic new sea subduction dna sea floor spreading dense plate tectonics afar oceanic basins Search external links cited by footnotes on Wikipedia page Seafloor spreading: |
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