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sea-floor spreading  search
UFocean-floor spreading
 sea floor spreading
 spreading concept
 spreading-floor hypothesis
RTmantle
 accreting plate boundary
 geosynclines
 marine geology
 magnetic anomalies
 continental drift
 mid-ocean ridges
 crust
 heat flow
 Benioff zone
 Iceland Research Drilling Project
 expanding Earth
 fracture zones
 geotectonic maps
 mid-ocean ridge basalts
 Mohoro
SNUsed for topics related to the hypothesis that the oceanic crust is increasing by convective upwelling of magma along the mid-ocean ridges or world rift system.