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- Seafloor_spreading abstract "Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. Basaltic magma rises up the fractures and cools on the ocean floor to form new sea floor. Older rocks will be found farther away from the spreading zone while younger rocks will be found nearer to the spreading zone.Earlier theories (e.g. by Alfred Wegener and Alexander du Toit) of continental drift were that continents "ploughed" through the sea. The idea that the seafloor itself moves (and carries the continents with it) as it expands from a central axis was proposed by Harry Hess from Princeton University in the 1960s. The theory is well-accepted now, and the phenomenon is known to be caused by convection currents in the plastic, very weak upper mantle, or asthenosphere.".
- Seafloor_spreading thumbnail Earth_seafloor_crust_age_1996.gif?width=300.
- Seafloor_spreading wikiPageExternalLink ridge.html.
- Seafloor_spreading wikiPageID "145698".
- Seafloor_spreading wikiPageRevisionID "602000190".
- Seafloor_spreading hasPhotoCollection Seafloor_spreading.
- Seafloor_spreading subject Category:Geological_processes.
- Seafloor_spreading subject Category:Plate_tectonics.
- Seafloor_spreading type GeologicalProcess113486838.
- Seafloor_spreading type GeologicalProcesses.
- Seafloor_spreading type NaturalProcess113518963.
- Seafloor_spreading type PhysicalEntity100001930.
- Seafloor_spreading type Process100029677.
- Seafloor_spreading comment "Seafloor spreading is a process that occurs at mid-ocean ridges, where new oceanic crust is formed through volcanic activity and then gradually moves away from the ridge. Seafloor spreading helps explain continental drift in the theory of plate tectonics. When oceanic plates diverge, tensional stress causes fractures to occur in the lithosphere. Basaltic magma rises up the fractures and cools on the ocean floor to form new sea floor.".
- Seafloor_spreading label "Expansión del fondo oceánico".
- Seafloor_spreading label "Expansão do fundo oceânico".
- Seafloor_spreading label "Oceanische spreiding".
- Seafloor_spreading label "Ozeanbodenspreizung".
- Seafloor_spreading label "Seafloor spreading".
- Seafloor_spreading label "Spreading".
- Seafloor_spreading label "Спрединг".
- Seafloor_spreading label "تمدد قاع البحر".
- Seafloor_spreading label "海底扩张学说".
- Seafloor_spreading label "海洋底拡大説".
- Seafloor_spreading sameAs Rozpínání_oceánského_dna.
- Seafloor_spreading sameAs Ozeanbodenspreizung.
- Seafloor_spreading sameAs Expansión_del_fondo_oceánico.
- Seafloor_spreading sameAs 海洋底拡大説.
- Seafloor_spreading sameAs Oceanische_spreiding.
- Seafloor_spreading sameAs Spreading.
- Seafloor_spreading sameAs Expansão_do_fundo_oceânico.
- Seafloor_spreading sameAs m.012jjh.
- Seafloor_spreading sameAs Q215920.
- Seafloor_spreading sameAs Q215920.
- Seafloor_spreading sameAs Seafloor_spreading.
- Seafloor_spreading wasDerivedFrom Seafloor_spreading?oldid=602000190.
- Seafloor_spreading depiction Earth_seafloor_crust_age_1996.gif.
- Seafloor_spreading isPrimaryTopicOf Seafloor_spreading.
