SEAFLOORSPREADING

Seafloor spreading

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 further away from the spreading zone while younger rocks will be found nearer to the spreading zone.

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seafloor spreading

Noun

  1. The outward movement of the seafloor from central underwater ridges as a result of plate tectonics; the major cause of continental drift.


The above text is a snippet from Wiktionary: seafloor spreading
and as such is available under the Creative Commons Attribution/Share-Alike License.

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