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