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